Isotopes/mass #
Oxygen-17
Protons: 8
Neutrons: 9
Building block of matter
atom
Oxygen
6
Have the same number of valence electrons
groups
The number of protons
Atomic number
How many neutrons in helium-4
2
smaller particles that make up an atom
subatomic particles
Sodium
1
the number of occupied energy levels
Periods
Protons+neutrons
Atomic mass
Carbon-14
Proton: 6
Neutron: 8
Matter cannot be created or destroyed but can change forms.
Law of conservation
neon
8
The most reactive group
Alkali Metals
Suggested there must be tiny but concentrated positively charged mass in the center of the atom
Rutherford
Hydrogen-1
proton:1
Neutron:0
A region of space around the nucleus where electrons are most likely to be found
Orbitals
Aluminum
3
How does the reactivity of the alkali metals change as you go down the group from top to bottom?
increases
model illustrates negatively charged particles spread evenly throughout a positively charged mass of matter
Plum Pudding Model
How many neutrons in Magnesium-24
12
Atoms of an element with the same number of protons but different numbers of neutrons
Isotopes
Nitrogen
5
What is the least reactive group?
Noble Gases
How do electrons move between orbitals?
gaining or losing energy