Elements Symbols
Atomic Structure
Periodic Table Basics
Counting Atoms
Bohr's Atomic Model
100
He
Helium
100
Which particle has a positive charge?
Proton
100
How many periods are in the periodic table?
7
100
How many atoms are in O2 ?
2
100
What is the atomic number of this atom?
2
200
P
Phosphorus
200
Which particle that has no charge?
Neutron
200
The atomic number is the number of ___ in the atom's nucleus.
Protons
200
How many atoms of each element are in NaCl?
Na=1, Cl=1
200
7
300
Fe
Iron
300
Which particles make up the nucleus of an atom?
Protons and Nucleus
300
Elements in the periodic table are listed in order of their ___.
Atomic Number
300
HCl has how many atoms of each element?
H=1, Cl=1
300
Nitrogen
400
Au
Gold
400
What does the atomic number represent?
The number of protons or electrons
400
The number found below the chemical name is the ___.
Atomic Mass
400
How many elements are in this compound?... NaHCO3
4
400
What element is represented in this Bohr Model?
Lithium
500
K
Potassium
500
What is the atomic mass for helium?
4
500
How many groups make up the periodic table?
18
500
4 NaCl represents several molecules of table salt. How many atoms of chlorine are present in this example?
4
500
An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the atom?
15