Unit 1 practice

__________ has a negative charge.

• Protons

• Neutrons

• Electrons

• I'm not sure

Electrons and protons _______ each other.

• attract

• repel

As an electron gets closer to the nucleus the _______ to the nucleus gets ________.

• attraction

• repulsion

• stronger

• weaker

What is the valence electron for Helium.

• 5

• 4

• 8

• 2

What is the number of valence electrons for Phosphorus.

• 8

• 4

• 2

• 5

The electron configuration for sulfur is 1s2 2s2 2p6 3s2 3p4.

• True

• False

A positively charged ion is called a __________.

• cation

• anion

A negatively charged ion is called a ____________.

• anion

• cation

An electrically charged atom that gained or lost one or more electrons is called an ion.

• True

• False

Which element has an atomic number of 17.

• Krypton

• Gallium

• Chlorine

• Helium