Reactions of common metals and properties of
... atoms, and the comparatively low energy required to detach this electron from the atom, as shown by the ionization energies. Element H Li Na K Rb Cs ...
... atoms, and the comparatively low energy required to detach this electron from the atom, as shown by the ionization energies. Element H Li Na K Rb Cs ...
- Angelo State University
... • What makes elements different from each another is the number of protons in their atoms, called the atomic number (Z). All atoms of the same element contain the same number of protons. – The number of protons determines the number of electrons in a neutral atom. – Since most of the volume of the a ...
... • What makes elements different from each another is the number of protons in their atoms, called the atomic number (Z). All atoms of the same element contain the same number of protons. – The number of protons determines the number of electrons in a neutral atom. – Since most of the volume of the a ...
Many-electron atoms
... With K and Ca, successive electrons go into the 4s orbital, and Ca has the electronic configuration [Ar]4s2. At this point, the pattern changes. To a first approximation, the 10 electrons for the next 10 elements (Sc to Zn) enter the 3d orbitals, giving Zn the electronic configuration 4s23d10. Ther ...
... With K and Ca, successive electrons go into the 4s orbital, and Ca has the electronic configuration [Ar]4s2. At this point, the pattern changes. To a first approximation, the 10 electrons for the next 10 elements (Sc to Zn) enter the 3d orbitals, giving Zn the electronic configuration 4s23d10. Ther ...
Atomic Information
... • If electrons are added to the atom, then there are more negative charges than positive charges. The atom becomes negatively charged and is called an anion. • If electrons are removed from the atom, then there are less negative charges than positive charges. The atom becomes positively charged and ...
... • If electrons are added to the atom, then there are more negative charges than positive charges. The atom becomes negatively charged and is called an anion. • If electrons are removed from the atom, then there are less negative charges than positive charges. The atom becomes positively charged and ...
Chapter 4 Notes
... Reviewing Concepts • 1. When is an electron in an atom likely to move from one energy level to another? • 2. What model do scientists use to describe how electrons move around the nucleus? • 3. Describe the most stable configuration of the electrons in an atom. • 4. What did Bohr contribute to moder ...
... Reviewing Concepts • 1. When is an electron in an atom likely to move from one energy level to another? • 2. What model do scientists use to describe how electrons move around the nucleus? • 3. Describe the most stable configuration of the electrons in an atom. • 4. What did Bohr contribute to moder ...
compound - Coal City Unit #1
... 1st letter is always capitalized, second letter is always sm. case • most symbols come from their names • some symbols come from Latin or Greek names • some elem. named in honor of person or place they were discovered • ea. elem. has its own unique set of chem. and physical props. ...
... 1st letter is always capitalized, second letter is always sm. case • most symbols come from their names • some symbols come from Latin or Greek names • some elem. named in honor of person or place they were discovered • ea. elem. has its own unique set of chem. and physical props. ...
File
... 1) Represented by a symbol; all are found on the Periodic Table 2) Made a mental model of the atom; Greek philosopher 3) Used by Rutherford in his experiment; made of two protons and two neutrons 4) The paths in which electrons circle the nucleus according to the Bohr model 5) The positive particle ...
... 1) Represented by a symbol; all are found on the Periodic Table 2) Made a mental model of the atom; Greek philosopher 3) Used by Rutherford in his experiment; made of two protons and two neutrons 4) The paths in which electrons circle the nucleus according to the Bohr model 5) The positive particle ...
Chemistry 1st Semester Practice Exam
... in a nucleus C. the number of protons or electrons in a ...
... in a nucleus C. the number of protons or electrons in a ...
Chapter 7 Electron Structure of the Atom
... • The valence level contains electrons that are highest in energy and occupy orbitals that extend further from the nucleus than those in the lower levels. • Valence electrons occupy orbitals in the valence level. All the other electrons are called core electrons, or inner electrons. ...
... • The valence level contains electrons that are highest in energy and occupy orbitals that extend further from the nucleus than those in the lower levels. • Valence electrons occupy orbitals in the valence level. All the other electrons are called core electrons, or inner electrons. ...
Atomic Structure
... 2. The atoms of any one element are different from those of any other element. 3. Atoms of different elements can combine with another in simple whole number ratios to form compounds. 4. Chemical reactions occur when atoms are separated, joined, or rearranged. However, atoms of one element cannot be ...
... 2. The atoms of any one element are different from those of any other element. 3. Atoms of different elements can combine with another in simple whole number ratios to form compounds. 4. Chemical reactions occur when atoms are separated, joined, or rearranged. However, atoms of one element cannot be ...
Atoms
... attract Similarly charged particles repel The positively charged protons in the nucleus and the negatively charged electrons is what holds the atom together. ...
... attract Similarly charged particles repel The positively charged protons in the nucleus and the negatively charged electrons is what holds the atom together. ...
The Development of Atomic Theory
... cutting matter in half? There was a limit to how far you could divide matter. You would eventually end up with a piece of matter that could not be cut. He thought matter is like motion. It cannot be divided in half forever. The tortoise and hare would never finish the race if you could keep dividing ...
... cutting matter in half? There was a limit to how far you could divide matter. You would eventually end up with a piece of matter that could not be cut. He thought matter is like motion. It cannot be divided in half forever. The tortoise and hare would never finish the race if you could keep dividing ...
Atomic number, atomic mass and isotopes
... Appendix B and check out the atomic numbers and atomic masses of your favourite elements. Isotopes. Isotopes are atoms of the same element that have different atomic masses; they have the same number of protons, but different numbers of neutrons. Look at the element chlorine in Appendix B. Its atomi ...
... Appendix B and check out the atomic numbers and atomic masses of your favourite elements. Isotopes. Isotopes are atoms of the same element that have different atomic masses; they have the same number of protons, but different numbers of neutrons. Look at the element chlorine in Appendix B. Its atomi ...
SCH 3U - othsmath
... (electron affinity) energy is released. 2) Going down a group, a new energy level is added with each subsequent atom, ensuring the valence electrons are moved further and further from the nucleus. This increases the shielding provided by non-valence electrons, decreases the ENC (even though the numb ...
... (electron affinity) energy is released. 2) Going down a group, a new energy level is added with each subsequent atom, ensuring the valence electrons are moved further and further from the nucleus. This increases the shielding provided by non-valence electrons, decreases the ENC (even though the numb ...
Honors Chemistry
... possible energy state. This occurs if the first shell is filled before electrons are placed in the second shell, the second shell is filled before electrons are placed in the third shell, etc. ...
... possible energy state. This occurs if the first shell is filled before electrons are placed in the second shell, the second shell is filled before electrons are placed in the third shell, etc. ...
Section 3.6
... 16. (a) Dimes were shipped out of the country because it is illegal to deface or alter Canadian currency in Canada. (b) These metals have very different magnetic properties, which could be used to separate them. (c) A magnet should separate these coins easily, because nickel is ferromagnetic (strong ...
... 16. (a) Dimes were shipped out of the country because it is illegal to deface or alter Canadian currency in Canada. (b) These metals have very different magnetic properties, which could be used to separate them. (c) A magnet should separate these coins easily, because nickel is ferromagnetic (strong ...
Unit 2
... More ______________________ than electrons = radii shrinking (getting smaller) because the positive charge is greater than the smaller negative charges and pulls them in toward the nucleus. ii. More ____________________________ than protons = radii increases (getting larger) because the electrons ar ...
... More ______________________ than electrons = radii shrinking (getting smaller) because the positive charge is greater than the smaller negative charges and pulls them in toward the nucleus. ii. More ____________________________ than protons = radii increases (getting larger) because the electrons ar ...
200 Ways to Pass the Chemistry
... 85. Atomic radii decrease left to right across a period due to increasing nuclear charge. Which period 3 element among the diagrams below has the largest radius? 86. Atomic radii increase as you go down a group due to increased electron energy levels. Which alkali metal among the diagrams below has ...
... 85. Atomic radii decrease left to right across a period due to increasing nuclear charge. Which period 3 element among the diagrams below has the largest radius? 86. Atomic radii increase as you go down a group due to increased electron energy levels. Which alkali metal among the diagrams below has ...
200 Things to Know to Pass the Chemistry Regents
... 85. Atomic radii decrease left to right across a period due to increasing nuclear charge. Which period 3 element among the diagrams below has the largest radius? 86. Atomic radii increase as you go down a group due to increased electron energy levels. Which alkali metal among the diagrams below has ...
... 85. Atomic radii decrease left to right across a period due to increasing nuclear charge. Which period 3 element among the diagrams below has the largest radius? 86. Atomic radii increase as you go down a group due to increased electron energy levels. Which alkali metal among the diagrams below has ...
Periodic table
The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number (number of protons in the nucleus), electron configurations, and recurring chemical properties. The table also shows four rectangular blocks: s-, p- d- and f-block. In general, within one row (period) the elements are metals on the lefthand side, and non-metals on the righthand side.The rows of the table are called periods; the columns are called groups. Six groups (columns) have names as well as numbers: for example, group 17 elements are the halogens; and group 18, the noble gases. The periodic table can be used to derive relationships between the properties of the elements, and predict the properties of new elements yet to be discovered or synthesized. The periodic table provides a useful framework for analyzing chemical behavior, and is widely used in chemistry and other sciences.Although precursors exist, Dmitri Mendeleev is generally credited with the publication, in 1869, of the first widely recognized periodic table. He developed his table to illustrate periodic trends in the properties of the then-known elements. Mendeleev also predicted some properties of then-unknown elements that would be expected to fill gaps in this table. Most of his predictions were proved correct when the elements in question were subsequently discovered. Mendeleev's periodic table has since been expanded and refined with the discovery or synthesis of further new elements and the development of new theoretical models to explain chemical behavior.All elements from atomic numbers 1 (hydrogen) to 118 (ununoctium) have been discovered or reportedly synthesized, with elements 113, 115, 117, and 118 having yet to be confirmed. The first 94 elements exist naturally, although some are found only in trace amounts and were synthesized in laboratories before being found in nature. Elements with atomic numbers from 95 to 118 have only been synthesized in laboratories. It has been shown that einsteinium and fermium once occurred in nature but currently do not. Synthesis of elements having higher atomic numbers is being pursued. Numerous synthetic radionuclides of naturally occurring elements have also been produced in laboratories.