Atomic Structure and Periodic Table Exam Review

Valence electrons determine an element's reactivity (chemical properties). How many valence electrons does this atom have?

• 8

• 2

• 1

• 11

What is the mass of this atom?

• 10

• 9

• 6

• 3

Element Y is represented by the symbol

²³₁₁Y

Select the statements that are true about an atom of element Y.

• An atom of Y has 11 protons.

• An atom of Y has 12 protons.

• An atom of Y has 12 neutrons.

• An atom of Y has 11 neutrons.

• An atom of Y has 11 electrons.

Which part of an atom is used to identify it?

• number of protons

• number of neutrons

• number of electrons

Al⁺³

The +3 tell you the

• number of protons.

• atomic mass.

• charge of the atom.

An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number.

• 20

• 10

• 35

• 25

The atomic number of an element that has 9 protons, 9 electrons, and 10 neutrons is _____.

• 9
• 10
• 19
• 28

An element with a mass number of 11 and an atomic number of 5 has how many neutrons?

• 11
• 5
• 6
• 16

A horizontal row of elements in the periodic table

• Molecule

• Period

• Family

• Atom

A neutral fluorine atom has 9 protons and 9 electrons. How many electrons does fluoride ion, F^-1, have?

• 8

• 9

• 10

• 18