atoms - sciencegeek
... He discovered the nucleus and proposed a nuclear atom in which electrons surround a dense nucleus. He thought of the rest of the atom as empty space. ...
... He discovered the nucleus and proposed a nuclear atom in which electrons surround a dense nucleus. He thought of the rest of the atom as empty space. ...
Periodic Trends Notes 14-15
... • trends are easier to understand if you comprehend the following • the ability of an atom to “hang on to” or attract its valence electrons is the result of two opposing forces – the attraction between the electron and the nucleus – the repulsions between the electron in question and all the other ...
... • trends are easier to understand if you comprehend the following • the ability of an atom to “hang on to” or attract its valence electrons is the result of two opposing forces – the attraction between the electron and the nucleus – the repulsions between the electron in question and all the other ...
WILF 1 - GCSE Chemistry Help
... nucleus is poorly shielded, chlorine atoms are bigger and have two full inner electron shells o its nucleus is very close to the electron to be captured; chlorine’s nucleus is much further away The nuclear attraction force acting on the electron being captured is much stronger in the case of flu ...
... nucleus is poorly shielded, chlorine atoms are bigger and have two full inner electron shells o its nucleus is very close to the electron to be captured; chlorine’s nucleus is much further away The nuclear attraction force acting on the electron being captured is much stronger in the case of flu ...
Ch 5 Notes
... columns, starting a new row each time the chemical properties repeated • Left blank spaces in his table, concluding that these spaces were elements that hadn’t been discovered yet. • Based on the patterns and the other elements around the blank space, he predicted the properties of those elements ...
... columns, starting a new row each time the chemical properties repeated • Left blank spaces in his table, concluding that these spaces were elements that hadn’t been discovered yet. • Based on the patterns and the other elements around the blank space, he predicted the properties of those elements ...
Chapter 4: The Periodic Table
... 7. Explain the difference in the conduction bands of metals, nonmetals, and semiconductors. In metals, the conduction bands are low in energy, and electrons are easily excited into those bands. In semiconductors, the conduction bands are of higher energy, so more energy is required to excite electro ...
... 7. Explain the difference in the conduction bands of metals, nonmetals, and semiconductors. In metals, the conduction bands are low in energy, and electrons are easily excited into those bands. In semiconductors, the conduction bands are of higher energy, so more energy is required to excite electro ...
Unit Expectations – Periodic Table
... SWBAT - Identify the number of valence electrons, whether the elements would gain or lose electrons and give the oxidation number / charge. Students will also be able to differentiate between oxidation number and charge in words and through symbols using elements.; C4.9x Electron Energy Levels The r ...
... SWBAT - Identify the number of valence electrons, whether the elements would gain or lose electrons and give the oxidation number / charge. Students will also be able to differentiate between oxidation number and charge in words and through symbols using elements.; C4.9x Electron Energy Levels The r ...
Atomic structure – follow on cards
... It can be given as an individual exercise in class or for homework. The student could cut out and stick the cards into their exercise book, placing and numbering them in order. Otherwise, ask students to arrange the cards in sequential order in a pile. They can be quickly checked to see if task is d ...
... It can be given as an individual exercise in class or for homework. The student could cut out and stick the cards into their exercise book, placing and numbering them in order. Otherwise, ask students to arrange the cards in sequential order in a pile. They can be quickly checked to see if task is d ...
Chapter 3 Atoms and Elements Classification of Matter Matter Matter
... Isotopes of Magnesium In naturally occurring magnesium, there are three isotopes. Isotopes of Sulfur A sample of naturally occurring sulfur contains several isotopes with the following abundances ...
... Isotopes of Magnesium In naturally occurring magnesium, there are three isotopes. Isotopes of Sulfur A sample of naturally occurring sulfur contains several isotopes with the following abundances ...
21 • Electron Transfer Reactions
... 2. The highest energy orbital in boron, B, is _____. 3. The orbital farthest from the nucleus in Cr is _____. 4. The number of orbitals when n=3 is _____. 5. The number of electrons that have n=2 is _____. 6. The orbital that fills after the 6s is _____. 7. Circle the orbital representations that co ...
... 2. The highest energy orbital in boron, B, is _____. 3. The orbital farthest from the nucleus in Cr is _____. 4. The number of orbitals when n=3 is _____. 5. The number of electrons that have n=2 is _____. 6. The orbital that fills after the 6s is _____. 7. Circle the orbital representations that co ...
Activity 2 Elements and Their Properties
... bodies different in form.” The first modern definition of element, which is not much different, is from Robert Boyle: “Bodies, which not being made of any other bodies, or of one another, are the ingredients of which all those . . . mixed bodies are . . . compounded.” Scientists now state that an el ...
... bodies different in form.” The first modern definition of element, which is not much different, is from Robert Boyle: “Bodies, which not being made of any other bodies, or of one another, are the ingredients of which all those . . . mixed bodies are . . . compounded.” Scientists now state that an el ...
The Periodic Table Notes
... Explain what the terms metal, nonmetal, and metalloid mean. Organizing the Elements: In the late 1800s, ___________________________________________ searched for a way to organize the elements. o ...
... Explain what the terms metal, nonmetal, and metalloid mean. Organizing the Elements: In the late 1800s, ___________________________________________ searched for a way to organize the elements. o ...
Periodic Table and Trends Test Review KEY Describe the common
... • They are so reactive they are not found as free elements in nature 3. Transition metals (# of valence electrons = 2) • Metals with typical metallic properties and uses • Less reactive than group 1 and 2 metals – some are so unreactive that they exist in nature as freeelements • Used in jewelry, co ...
... • They are so reactive they are not found as free elements in nature 3. Transition metals (# of valence electrons = 2) • Metals with typical metallic properties and uses • Less reactive than group 1 and 2 metals – some are so unreactive that they exist in nature as freeelements • Used in jewelry, co ...
Chapter 7 Periodic Properties of the Elements
... elements should be grouped. Periodic Properties of the Elements ...
... elements should be grouped. Periodic Properties of the Elements ...
The Periodic Law Notes (Chapter 5) – Part 2
... -never found free in nature -harder, denser, stronger than alkali - ns2 (ending of all electron configurations for this group), because they have 2 electrons in the s sublevel, this makes them a little less reactive then the Alkali metals in group 1 ...
... -never found free in nature -harder, denser, stronger than alkali - ns2 (ending of all electron configurations for this group), because they have 2 electrons in the s sublevel, this makes them a little less reactive then the Alkali metals in group 1 ...
Scientific Method and Atomic Structure: A Brief Review
... Chemistry 1c. Students know how to use the periodic table to identify alkali metals, alkaline earth metals and transition metals, trends in ionization energy, electronegativity, and the relative sizes of ions and atoms. The periodic table is full of patterns. In addition to predicting the number of ...
... Chemistry 1c. Students know how to use the periodic table to identify alkali metals, alkaline earth metals and transition metals, trends in ionization energy, electronegativity, and the relative sizes of ions and atoms. The periodic table is full of patterns. In addition to predicting the number of ...
Periodicity - ilc.edu.hk
... Atomic number of an element is not related to the mass of an atom of the element. The atomic number of an element is the number of protons in an atom of the element. It is unique for each element. The mass of an atom of the element is mainly determined by the number of protons and neutrons in the nu ...
... Atomic number of an element is not related to the mass of an atom of the element. The atomic number of an element is the number of protons in an atom of the element. It is unique for each element. The mass of an atom of the element is mainly determined by the number of protons and neutrons in the nu ...
period
... (column) have the same number of electrons in their outermost shell (ref. p. 150) It is these electrons that determine the behavior of the element (chemical properties), including how it reacts with other elements – and how it forms ions. ...
... (column) have the same number of electrons in their outermost shell (ref. p. 150) It is these electrons that determine the behavior of the element (chemical properties), including how it reacts with other elements – and how it forms ions. ...
Chapter 2 Elements are made up of small particles called atoms. All
... The periodic table is a chart where elements are organized depending on how similar they are. The horizontal rows are called periods and the vertical columns are called groups or families. ...
... The periodic table is a chart where elements are organized depending on how similar they are. The horizontal rows are called periods and the vertical columns are called groups or families. ...
Section 6.1 Development of the Modern Periodic Table
... • Group 17 is composed of highly reactive elements called halogens. • Group 18 gases are extremely unreactive and commonly called noble gases. ...
... • Group 17 is composed of highly reactive elements called halogens. • Group 18 gases are extremely unreactive and commonly called noble gases. ...
the atomic theory
... Group 8 elements are called noble gases. These are un-reactive gases that are commonly used in light bulbs. ...
... Group 8 elements are called noble gases. These are un-reactive gases that are commonly used in light bulbs. ...
InterpretatingGraphics
... Thousands of periodic tables have been published since Mendeleev published his table. Each one is a little different from the rest. Shown above are keys to two of the hundreds of periodic tables now available. A key is an example or roadmap for using a periodic table. Use the above keys to answer th ...
... Thousands of periodic tables have been published since Mendeleev published his table. Each one is a little different from the rest. Shown above are keys to two of the hundreds of periodic tables now available. A key is an example or roadmap for using a periodic table. Use the above keys to answer th ...
Introductory Chemistry
... ¾ The elements in the periodic table are arranged by increasing atomic number and they have repeating chemical and physical properties. ¾ Atomic radius and metallic character increase from bottom to top and from left to right across the periodic table. ¾ The periodic table can be broken down into bl ...
... ¾ The elements in the periodic table are arranged by increasing atomic number and they have repeating chemical and physical properties. ¾ Atomic radius and metallic character increase from bottom to top and from left to right across the periodic table. ¾ The periodic table can be broken down into bl ...
Mendeleef`s Periodic Table
... be discovered. e.g., he left spaces for Ga and Ge and named these elements as Ekaaluminium (Ga) and EKa-silicon (Ge)respectively 3. Atomic mass correction of doubtful elements on the basis of their expected positions and properties. Defects in the Mendeleef’s Periodic Table (i) Position of hydrogen ...
... be discovered. e.g., he left spaces for Ga and Ge and named these elements as Ekaaluminium (Ga) and EKa-silicon (Ge)respectively 3. Atomic mass correction of doubtful elements on the basis of their expected positions and properties. Defects in the Mendeleef’s Periodic Table (i) Position of hydrogen ...
6.6 – Periodic Table
... Group or Family – Vertical column on the periodic table. These elements in groups or families usually share similar chemical properties. Period – Horizontal row on the periodic table. These elements have the same number of occupied energy levels. Valence Electrons – Electrons found in the outermost ...
... Group or Family – Vertical column on the periodic table. These elements in groups or families usually share similar chemical properties. Period – Horizontal row on the periodic table. These elements have the same number of occupied energy levels. Valence Electrons – Electrons found in the outermost ...
Group 3 element
Group 3 is a group of elements in the periodic table. This group, like other d-block groups, should contain four elements, but it is not agreed what elements belong in the group. Scandium (Sc) and yttrium (Y) are always included, but the other two spaces are usually occupied by lanthanum (La) and actinium (Ac), or by lutetium (Lu) and lawrencium (Lr); less frequently, it is considered the group should be expanded to 32 elements (with all the lanthanides and actinides included) or contracted to contain only scandium and yttrium. The group itself has not acquired a trivial name; however, scandium, yttrium and the lanthanides are sometimes called rare earth metals.Three group 3 elements occur naturally, scandium, yttrium, and either lanthanum or lutetium. Lanthanum continues the trend started by two lighter members in general chemical behavior, while lutetium behaves more similarly to yttrium. This is in accordance with the trend for period 6 transition metals to behave more similarly to their upper periodic table neighbors. This trend is seen from hafnium, which is almost identical chemically to zirconium, to mercury, which is quite distant chemically from cadmium, but still shares with it almost equal atomic size and other similar properties. They all are silvery-white metals under standard conditions. The fourth element, either actinium or lawrencium, has only radioactive isotopes. Actinium, which occurs only in trace amounts, continues the trend in chemical behavior for metals that form tripositive ions with a noble gas configuration; synthetic lawrencium is calculated and partially shown to be more similar to lutetium and yttrium. So far, no experiments have been conducted to synthesize any element that could be the next group 3 element. Unbiunium (Ubu), which could be considered a group 3 element if preceded by lanthanum and actinium, might be synthesized in the near future, it being only three spaces away from the current heaviest element known, ununoctium.