Intro Unit
How many significant figures are in 0.0093060?
5
What is the atomic number of Tellurium (Te)?
52
How many valence electrons does Germanium (Ge) have?
4
Name the group 1 elements and list one property they have.
Alkali metals
shiny, soft metals, very reactive to water
Write the formula of tetraphosphorus dichloride.
P4Cl2
Add 45.90 + 3 and record your answer with the correct sig figs.
49
(round to the least number of decimal places)
Define an isotope.
An atom with the same number of protons (same element), but a different number of neutrons.
Which energy diagram rule tells you that electrons will only pair up in an orbital if all the orbitals in the sublevel are occupied?
Hund's Rule
Describe the properties of metalloids and give one element that is a metalloid.
Semiconductors, properties of both metals and nonmetals
B, Si, Ge, As, Sb, Te, Po, At
Write the formula of silver nitrate.
AgNO3
Write 49,045,000,000 in scientific notation.
4.9045x1010
Describe how to find the number of neutrons in an atom or ion.
Mass number - protons
Not found on the periodic table
Write the electron configuration of Nickel (Ni).
1s22s22p63s23p64s23d8
This trend is an atom's ability to attract electrons in a bonding pair.
Electronegativity
You are trying to determine if a compound is ionic or covalent. You test the conductivity of the solid and it is nonconductive. Then, you put it in a solution with water and it is very conductive. What type of compound do you have?
Ionic
Multiply 5.77 x 0.90 and record your answer to the correct number of sig figs.
5.2
(round to the least number of sig figs)
Iodine is 80% 127I, 17% 126I, and the remainder is 128I. Calculate the average atomic mass of iodine. (You have to show your work)
(.80 x 127) + (.17 x 126) + (.03 x 128) = 126.86 amu
Draw the Bohr model of 31P. Include protons and neutrons in the nucleus.
nucleus: 15 protons and 16 neutrons
1st orbit: 2 electrons
2nd: 8 electrons
3rd: 5 electrons
Explain why noble gases are inert.
They are not reactive because they have a full valence shell of electrons (octet) so they don't want to gain or lose any.
Is the following bond ionic, polar covalent, or nonpolar covalent? Then draw in charges.
F - N
Polar covalent
partial negative on F and partial positive on N
Convert 88.6 ng to kg using dimensional analysis.
8.86x10-11 kg
How many protons, neutrons, and electrons are in 80Br-1?
P+: 35
n0: 45 (80-35)
e-: 36 (add one to the protons because of charge)
Describe what happens to the electrons in an atom to create a photon.
Heat or electricity excites electrons, causing them to jump to a higher energy orbital. They immediately fall back to ground state. When they fall back to ground state, they release a photon, or a packet of light energy.
List the following in order of increasing atomic radius:
Ge , Ti , Co
Ge < Co < Ti
decreases across the period
Name PbO2
lead (IV) oxide