Unit 2: Redemption Round

a

1

The electron cloud is made up of this

Electrons

2

The nucleus has this charge

Positive

3

These are responsible for the strong nuclear force

Quarks

4

An ion is the name for an atom with this property

A charge

5

Elements in the same period on the periodic table have the same # of this

Shells or energy levels

b

1

The name for horizontal rows on the periodic table

Periods

2

Isotopes have a different number of this

Neutrons

3

The mass number of an atom is equal to this

The number of protons + the number of neutrons

4

The nucleus is held together by this force

Strong nuclear force

5

In this type of nuclear reaction, a large atom is split into smaller atoms

Fission

c

1

Name of the negatively charged subatomic particle

Electron

2

Radioactivity refers to the emission of this

Radiation

3

In this model of the atom, electrons are in shells but do not travel in fixed orbits

Electron cloud model

4

This refers to when an unstable nucleus emits radiation and can no longer hold itself together

Radioactive decay

5

This type of nuclear reaction occurs in stars

Fusion

d

1

Name of the neutrally charged subatomic particle

Neutron

2

Name of the outermost electrons in the electron cloud

Valence electrons

3

An atom with 4 protons and 3 neutron would have this atomic number

4

4

The electromagnetic force holds together these two things

The nucleus and the electron cloud

5

This type of radiation is pure energy

Gamma ray

e

1

The charge that a proton has

Positive

2

The name for how long it takes for half of a radioactive sample to decay

Half-life

3

The atomic number is the number of this in an atom

Protons

4

This type of nuclear reaction results in nuclear waste

Fission

5

Alpha particles are made up of this

2 protons and 2 neutrons