Unit 4 Study Guide (Test on Friday 3/10) ANSWER
... electrons in the first energy level and 4 electrons in the second energy level. The only number of particles that changes is neutrons!!! Electron and proton numbers stay the same with each isotope! ...
... electrons in the first energy level and 4 electrons in the second energy level. The only number of particles that changes is neutrons!!! Electron and proton numbers stay the same with each isotope! ...
Review Molecule: more than one atom, e.g., O2, H2, CO, H2O
... so the mass number of an atom has been defined as the number of protons and neutrons. The mass number is given the symbol A: A = mass number = # of protons + # of neutrons. The number of protons is unique to an element and is shown on the periodic table. ...
... so the mass number of an atom has been defined as the number of protons and neutrons. The mass number is given the symbol A: A = mass number = # of protons + # of neutrons. The number of protons is unique to an element and is shown on the periodic table. ...
electron
... mass 10.012 amu and a relative abundance of 19.91%. The isotope with mass 11.009 amu has a relative abundance of 80.09%. 1. Calculate the atomic mass of this element (show all work) and then name this element. ...
... mass 10.012 amu and a relative abundance of 19.91%. The isotope with mass 11.009 amu has a relative abundance of 80.09%. 1. Calculate the atomic mass of this element (show all work) and then name this element. ...
Ch. 5 notes
... • Democritus – 4th century BC – world made up of empty space and tiny particles called atoms (atomos) ‘indivisible’ – Hypothesized without using experiments ...
... • Democritus – 4th century BC – world made up of empty space and tiny particles called atoms (atomos) ‘indivisible’ – Hypothesized without using experiments ...
A Proton is a positively charged particle found in the atom
... The diameter of a nucleus is about 1/100,000 that of the atom. If the hydrogen nucleus were the size of a Ping-Pong ball, the atom (with a single electron) would have a diameter of 2 kilometers (1.2 mile). Atomic Number and Isotopes The Neutron In 1932 Irene and Frederic Joliot-Curie discovered a ty ...
... The diameter of a nucleus is about 1/100,000 that of the atom. If the hydrogen nucleus were the size of a Ping-Pong ball, the atom (with a single electron) would have a diameter of 2 kilometers (1.2 mile). Atomic Number and Isotopes The Neutron In 1932 Irene and Frederic Joliot-Curie discovered a ty ...
Test Review
... Alkali Metals- Group 1, most reactive metals on the periodic table. Form +1 ions, losing 1 electron to look like a noble gas. Too reactive to exist in nature freely. Must be stored in mineral oil. Alkaline Earth Metals – Group 2, not as reactive as alkali metals. Form +2 ions, losing 2 electrons to ...
... Alkali Metals- Group 1, most reactive metals on the periodic table. Form +1 ions, losing 1 electron to look like a noble gas. Too reactive to exist in nature freely. Must be stored in mineral oil. Alkaline Earth Metals – Group 2, not as reactive as alkali metals. Form +2 ions, losing 2 electrons to ...
12.1 Atoms and Isotopes
... If you look at a periodic table, you will notice that the atomic number increases by one whole number at a time. This is because you add one proton at a time for each element. The atomic mass however, increases by amounts greater than one. This difference is due to the neutrons in the nucleus. The v ...
... If you look at a periodic table, you will notice that the atomic number increases by one whole number at a time. This is because you add one proton at a time for each element. The atomic mass however, increases by amounts greater than one. This difference is due to the neutrons in the nucleus. The v ...
1. Which of the following is the most important - Hatboro
... d. there is no pattern 9. Moving from top to bottom in a group, atomic radius tends to _____________. 10. Moving from top to bottom in a group, shielding effect tends to _____________. 11. Moving from top to bottom in a group, electronegativity tends to _____________. 12. Moving from top to bottom i ...
... d. there is no pattern 9. Moving from top to bottom in a group, atomic radius tends to _____________. 10. Moving from top to bottom in a group, shielding effect tends to _____________. 11. Moving from top to bottom in a group, electronegativity tends to _____________. 12. Moving from top to bottom i ...
Chapter 2: Matter is Made up of Atoms
... Atoms are arranged in energy levels (e.l.’s), at different distances from nucleus Close to nucleus = low energy Far from nucleus = high energy e-s in highest occupied level are “valence e-s” Only so many e-’s can fit in energy levels e-s fill lower e.l.’s before being located in higher e. ...
... Atoms are arranged in energy levels (e.l.’s), at different distances from nucleus Close to nucleus = low energy Far from nucleus = high energy e-s in highest occupied level are “valence e-s” Only so many e-’s can fit in energy levels e-s fill lower e.l.’s before being located in higher e. ...
CHEM121 Lecture Ch2
... -What is the atomic number? 7 -What Element is this? Nitrogen -Is the atomic size Larger or Smaller than Boron? Smaller -Is the atomic size Larger or Smaller than Phosphorus? Smaller -What is the electron configuration? 1s2 2s2 2p3 ...
... -What is the atomic number? 7 -What Element is this? Nitrogen -Is the atomic size Larger or Smaller than Boron? Smaller -Is the atomic size Larger or Smaller than Phosphorus? Smaller -What is the electron configuration? 1s2 2s2 2p3 ...
NM Strand
... 52. A characteristic that can be observed or measured without changing the sample’s composition is 53. An experiment that determines the maximum number of grams of a substance that will dissolve in 100 grams of water measures: 54. Counting the number of cookies on a plate is what type of observation ...
... 52. A characteristic that can be observed or measured without changing the sample’s composition is 53. An experiment that determines the maximum number of grams of a substance that will dissolve in 100 grams of water measures: 54. Counting the number of cookies on a plate is what type of observation ...
Atomic History Notes.notebook
... Dalton devised an atomic theory (early 1800's) based on the following points: 1) Elements are composed of extremely small and indivisible particles called atoms. 2) Atoms of the same element are identical. 3) Atoms combine chemically in simple whole number ratios, H2O is a 2:1 ratio of hydrogen and ...
... Dalton devised an atomic theory (early 1800's) based on the following points: 1) Elements are composed of extremely small and indivisible particles called atoms. 2) Atoms of the same element are identical. 3) Atoms combine chemically in simple whole number ratios, H2O is a 2:1 ratio of hydrogen and ...
Periodic Table PP revised 2014
... increasing atomic mass • The modern periodic table is organized by increasing atomic number • This arrangement reflects the periodic recurrence of similar properties as the atomic number increases ...
... increasing atomic mass • The modern periodic table is organized by increasing atomic number • This arrangement reflects the periodic recurrence of similar properties as the atomic number increases ...
MID-TERM EXAM REVIEW! Unit 1 Convert the following: 1.) 2.02 x
... 11.) Potassium iodide completely dissolved in water 12.) Soil 13.) Chromium * Classify as chemical or physical changes. 14.) Shredding cheese 15.) Melting cheese 16.) Digesting cheese 17.) Making salt from sodium and chlorine 18.) Sprinkling salt on french fries * In what group (give number) are eac ...
... 11.) Potassium iodide completely dissolved in water 12.) Soil 13.) Chromium * Classify as chemical or physical changes. 14.) Shredding cheese 15.) Melting cheese 16.) Digesting cheese 17.) Making salt from sodium and chlorine 18.) Sprinkling salt on french fries * In what group (give number) are eac ...
Chapter 03
... shell has an s and a p subshell; the third shell has an s, a p, and a d subshell, and so on. ...
... shell has an s and a p subshell; the third shell has an s, a p, and a d subshell, and so on. ...
9 19 -1 atomic number mass number charge
... atomic number of 9, and therefore has 9 protons. All atoms of an element have the same atomic number, by definition. Mass number - This is the total number of nucleons, or protons and neutrons. You can get the number of neutrons by simple subtraction. In this case, the fluorine has 10 neutrons. Atom ...
... atomic number of 9, and therefore has 9 protons. All atoms of an element have the same atomic number, by definition. Mass number - This is the total number of nucleons, or protons and neutrons. You can get the number of neutrons by simple subtraction. In this case, the fluorine has 10 neutrons. Atom ...
Early Models of the Atom Worksheet
... j) Different elements combine together to form compounds. k) Discovered the electron. l) Electrons move around a central nucleus. m) Proposed the “plum pudding” model of the atom. n) Atoms of one element are different from the atoms of other elements. o) Observed streams of negatively charged partic ...
... j) Different elements combine together to form compounds. k) Discovered the electron. l) Electrons move around a central nucleus. m) Proposed the “plum pudding” model of the atom. n) Atoms of one element are different from the atoms of other elements. o) Observed streams of negatively charged partic ...
Structure - Mole Cafe
... table because putting them in their proper position would make the table very wide. ...
... table because putting them in their proper position would make the table very wide. ...