Chemistry 1
What number do you use to find the number of protons?
atomic number
What are the 3 main states of matter?
Solid, liquid, gas
What is the 25th element called?
Manganese or Mn
C-14 has how many neutrons?
8
What is the formula for density?
Density = Mass/Volume (Mass over volume)
How many periods are shown on the periodic table?
7
What is the atomic number of neon (Ne)?
10
A chemical bond between two nonmetals is called a(n)
covalent bond.
A positive ion is known as a(n)?
Cation
What is a valence electron?
Electron in the outermost energy level
When moving from left to right across the periodic table, what increases?
Atomic Number
Which is the correct formula for the compound formed between potassium and nitrogen?
K3N
What is in the nucleus in the atom?
protons and neutrons
Elements with the same number of protons but different number of neutrons
Isotope
Will oxygen accept or donate electrons? How many?
Accept two electrons
What are the elements in Group 18 called ?
Noble Gases
How many electrons are in the 3rd energy level?
18
What are the elements in Group 2 called ?
Alkaline Earth Metals
What are the elements in Group 1 called ?
Alkali Metals
Name all 3 subatomic particles.
Protons Neutrons Electrons
How are ions formed?
By losing or gaining valence electrons
A negatively charged ion
Anion
State the electron configuration of Ca
1s2 2s2 2p6 3s2 3p6 4s2
The Oxide ion has _____e-
10 e-
The sum of protons and neutrons in the nucleus of an atom is known as the _________
Mass number
A covalent bond is a sharing of
Electrons
Which is the correct formula for the compound chromium (II) oxide?
CrO
Name the compound CF4?
carbon tetrafluoride
What is the formula for zinc (II) bromide?
ZnBr2
Fluorine, chlorine, bromine, and iodine belong to the family of ______________
halogens
What is the percent composition of H2O?
%-H = 11.11%
%-O = 88.89%
Elements in Group 2A form ions with a charge of ___
+ 2
What group of elements satisfies the octet rule without forming compounds (do not react)?
Noble gas
CO2 is this type of bond
Covalent bond.
Which of the following is always nonpolar?
H2O NH3 CBr3F I2
all diatomic molecules are always nonpolar - I2