Chemistry Review

An electron is:

• Positively charged

• Negatively charged

• Neutral

The atomic number of an element tells us:

• The number of protons

• The number of neutrons

• The number of protons plus neutrons

• The atomic mass

Atoms of the same element with the same number of protons but different number of neutrons are called

• isotopes

• ions

Beryllium's atomic number is 4 and its atomic mass is 9. How many neutrons will a beryllium atom have?

• 4

• 5

• 9

• 13

Aluminum has 13 electrons, how many of them are valence electrons?

• 1

• 2

• 3

• 4

In a Bohr Diagram, the innermost shell has a maximum of how many electrons?

• 1

• 2

• 8

• 18

Calcium's atomic number is 20. A calcium ion has a charge of +2. How many electrons does a calcium ion have?

• 18

• 20

• 22

• 40

Tags

NGSS.MS-PS1-1

These make good SEMI-conductors

• metals

• metalloids

• non-metals

Given this Lewis dot structure, would Nitrogen form an anion or a cation ?

• Cation

• Anion

Tags

NGSS.MS-PS1-1

Boron's atomic number is 5. How many valence electrons will a boron atom have?

• 1

• 2

• 3

• 5

Tags

NGSS.MS-PS1-1