Big Idea 4: Reactivity Review

An atom will be neutral if the number of protons is equal to the number of _____.

• protons

• neutrons

• electrons

• octets

What charge will an atom have if it loses 2 electrons?

• +2
• -2
• 0
• +1

What charge will an atom have if it gains one electron?

• -1
• +1
• 1

Columns on the periodic table are called ______________, while rows on the periodic table are called ______________.

• groups; periods

• periods; groups

• verticals; horizontals

• horizontals; verticals

An atom's group number gives its number of ______ while an atom's period number gives its number of ______.

• valence electrons; electron shells

• electron shells; valence electrons

• total electrons; electron shells

• electron shells; total electrons

Using the periodic table, determine the name of the element that has 2 valence electrons and 6 electron shells.

• Francium

• Barium

• Molybdenum

• hydrogen

Which two elements are in the same period?

• Boron and Carbon

• Potassium and Sodium

• Lithium and Magnesium

• Zinc and Nitrogen

Which two elements are in the same group?

• Ca and Ba

• H and He

• Na and Mg

• Br and Kr

Select all the elements that have three electron shells?

• Al

• Ar

• Ga

• Na

• B

For most elements, how many valence electrons makes them stable (nonreactive)?

• 2

• 8

• 1

• 4