3.1
Name the neutral atoms:
1) I Have 44 Protons
2) I have 56 electrons
3) I have a a charge of +4 and in period 5
1) Ruthenium
2) Barium
3) Tin
Boron exists in two isotopes, boron-10 and boron-11. Based on the atomic mass, which isotope is more abundant? Why?
boron-11 is more abundant, closer to the atomic mass
________________ poor conductor of electricity
________________ usually a solid at room temp
________________ malleable
1) Nonmetal
2) Metal
3) Metal
Write the electron configuration (either notation acceptable) for the following ions:
1. N3-
2. Sr+
3. K+
1) 1s² 2s² 2p⁶
2) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹
3) 1s² 2s² 2p⁶ 3s² 3p⁶
Define the following terms:
1) Effective Nuclear Charge
2) Electron Shielding
1) Attractive force of Protons pulling on electrons
2) The inner electrons shielding the outer valance electrons from reaching the nucleus
What are the following element symbols:
1) Sodium
2) Potassium
3) Lead
4)Radon
1) Na
2) K
3) Pb
4) Rn
Neon has two isotopes. Ne-20 composes 90.5% of all neon. Determine the other isotope.
The ability of a material to be drawn into a thin wire is called ___________________________.
The ability of a material to be formed into thin sheets is called _________________________.
1) ductility
2) malleability
Answer for the following atom: Oxygen
Group and period number. Group name.
Electron configuration using the noble gas abbreviation.
Number of valence electrons.
Typical ionic charge.
Is the ion smaller or larger than the neutral atom?
nonmetal, Period 2
[He] 2s² 2p⁴
6 Valence electrons
Charge -2
Larger (gaining electrons)
What is the difference between ionization energy and electronegativity? explain in logical words.
ionization energy relates to an atom's ability to lose electrons, while electronegativity relates to an atom's ability to attract electrons in a chemical bond.
Decode This message with the elemental symbol:
Thorium, Iodine, Carbon, Potassium,
Oxygen, Fluorine,
Titanium (symbol backwards)
Th I C K
O F
iT (titanium backwards)
Strontium consists of four isotopes with masses of 84 (abundance 0.50%), 86 (abundance of 9.9%), 87 (abundance of 7.0%), and 88 (abundance of 82.6%). Calculate the average atomic mass of strontium.
The average atomic mass of strontium is 87.71 amu.
1. Metalloids are ___________________ (like metals) but ___________________ (like nonmetals).
2. A ______________________ is a material that has a moderate conductivity.
1) lustrous, brittle
2) semiconductor or semimetal
Draw the three trends on the board, then explain each in detail what they mean.
Atomic Radius: Increase to bottom left, the measure of the protons neutrons and electron radius of an atom. More protons means a smaller radius b/c the protons pull on the electrons.
Ionization energy: Increases to top right, more protons means the valance electrons will be shielded from the inner electrons. This makes it easy for them to be pull away.
Electronegativity: Increases to top right, electrons on the valence shell want to hold on to achieve a full octet.
1) Smaller atomic radius means _________ pull on electrons
2) Elements that are noble gasses have a _______ ionization energy/electronegativity because _______
3) Electronegativity decrease ______ a group because ______
1) stronger
2) Higher, they have a full octect and are stable
3) Electronegativity decreases down a group because the valence electrons are farther from the nucleus. (electron shielding)
complete the following for Silver(+8)
You can use your PT tables
Symbol, Protons, Neutrons, Electrons, Mass number, Charge, Metal or Nonmetal, Group
Ag, 47 protons, 61 neutrons, 39 electrons, 108 amu, +8 charge, Metal, Transition metal
Fill in the blanks.
____________________ have a mass of 0.0005 amu.
Protons have a ____________________ charge.
In addition to protons, ____________________ are in the nucleus and have a mass of ____ amu.
Write out the order in which electron orbitals are filled.
(Hint: not spdf)
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p
1) The event which radicalized the revolution and ended the first constitutional government was.....
The King's flight to Varennes
Arrange the following atoms in order of increasing effective nuclear charge experienced by the electrons in their valence shell:
1. K, P, Mg
2. S, O, Po
3. Eu, Pb, Ca
1) K < Mg < P
2) Po < S < O
3) Eu < Ca < Pb
Ca has a higher Zeff than Eu because:
Naturally occurring europium (Eu) consists of two isotopes with a mass of 151 and 153. Europium-151 has an abundance of 48.03% and Europium-153 has an abundance of 51.97%. What is the average atomic mass of europium?
152.0 amu.
An unknown element has two isotopes, 203 amu and 205 amu. The first has a relative abundance of 29.5%. The second has a relative abundance of 70.5%. Calculate the atomic mass and use it to identify the element.
Average atomic mass = 204.41 amu
Write the full electron configurations for the following elements.
1. nitrogen
2. silicon
3. holmium
1) 1s² 2s² 2p³
2) 1s² 2s² 2p⁶ 3s² 3p²
3) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹¹
1) The event which radicalized the revolution and ended the first constitutional government was.....
The night of August 4
Order each set of atoms/ions from smallest to largest.
1. Cl-, Br-, F-
2. Sr+, Ca2+, Sn
3. N3-, N, F-
1) F- < Cl- < Br-
2) Ca2+ < Sr+ < Sn
3) F- < N < N3-