Common Assessment 1 Review 8.5A and B

What numbers of valence electrons are the least reactive?

Answer explanation

What determines the reactivity of an atom?

• # of protons

• # of valence electrons

• # of neutrons

Answer explanation

What determines the IDENITY of an atom?

• # of protons

• # of valence electrons

• # of neutrons

Answer explanation

How many neutrons protons, and electrons does this element have?

• 6 neutrons, 10 protons, 10 electrons

• 5 neutrons, 5 protons, 5 electrons

• 11 neutrons, 5 protons, 5 electrons

• 6 neutrons, 5 protons, 5 electrons

Answer explanation

Subtract to find the neutrons

Tags

NGSS.MS-PS1-1

The area surrounding the nucleus .....

Select 2

• negative

• postive

• contains electrons

• contains neutrons

Answer explanation

ELECTRONS are on the outside and are NEGATIVE

This element has _____ protons.

Answer explanation

Tags

NGSS.MS-PS1-1

This element has _____ electrons.

Answer explanation

Tags

NGSS.MS-PS1-1

This element has _____ neutrons.

Answer explanation

Round and SUBTRACT to get the neutrons

Tags

NGSS.MS-PS1-1

Element 1 is

• Sulfur (S) because it has 16 protons.

• Oxygen (O) because it has 6 valence electrons.

• Sodium (Na) because it has 1 valence electrons.

• Lithium (Li) because it is in period 3.

Answer explanation

Protons IDENTIFY the atom

Tags

NGSS.MS-PS1-1

Element 2 is

• Strontium (Sr) because it is in period 3.

• Boron (B) because it is in period 5.

• Potassium (K) because it has 1 valence electrons.

• Rubidium (Rb) because it has 37 protons.

Answer explanation

Protons IDENTIFY the atom

Tags

NGSS.MS-PS1-1