Chem Unit Exam

On the periodic table, Groups are

• Horizontal rows

• Vertical columns

What happens when an atom loses an electron?

• The atom becomes negatively charged because it has more protons than electrons.

• The atom becomes neutral because the electrons are replaced by neutrons.

• The atom becomes radioactive due to the imbalance of subatomic particles.

• The atom becomes positively charged because it has more protons than electrons.

Given the electron shell capacity formula : 2(n)²

^{where (n) is the shell number, WHat is the capacity for the 6th electron shell?}

What is this element?

• Beryllium (atomic #4)

• Boron (atomic #5)

• Carbon (atomic #6)

• Nitrogen (atomic #7)

What is a compound?

• A substance made of atoms of only one element

• A substance made of two or more elements chemically bonded

• A physical mixture of two or more substances

• A gas formed by heating molecules

What is a valence electron?

• Electrons in the first energy shell

• Electrons in the second energy shell

• Electrons in the outer shell

• Total number of electrons

Which subatomic part of an atom gives it a positive charge?

• Neutron

• Proton

• Electron

• Ion

The innermost energy level has a maximum of how many electrons?

• 1

• 2

• 6

• 8

Name this element.

• Argon

• Chlorine

• Aluminum

• Boron

How many valence electrons?

• 2

• 3

• 4

• 5