Valence Electrons, Ions, and Periodic Trends

Match each element with its correct number of electrons.

• 32

• Sodium

• 10

• Germanium

• 11

• Neon

• 6

• Carbon

• 8

• Oxygen

Sort the elements by their number of energy levels (electron shells)

Groups:

(a) 1

,

(b) 2

,

(c) 3

,

(d) 4

• Boron

• Hydrogen

• Sodium

• Copper

• Aluminum

• Helium

• Argon

• Lithium

• Calcium

• Oxygen

True or False: Elements within the same group have the same number of valence electrons.

• True

• False

True or False: Elements within the same period have the same number of valence electrons.

• True

• False

Group 13 elements have ​ ​ (a)   ​ valence electron(s).

Group 14 elements have ​ ​ (b)   ​ valence electron(s).

Group 15 elements have ​ ​ (c)   ​ valence electron(s).

Group 16 elements have ​ ​ (d)   ​ valence electron(s).

• 3
• 4
• 5
• 6

Which group has 1 valence electron?

• Alkali Metals

• Alkali Earth Metals

• Halogens

• Noble Gases

Which group has 2 valence electrons?

• Alkali Metals

• Alkali Earth Metals

• Halogens

• Noble Gases

Which group has 7 valence electrons?

• Alkali Metals

• Alkali Earth Metals

• Halogens

• Noble Gases

Which group has 8 valence electrons?

• Alkali Metals

• Alkali Earth Metals

• Halogens

• Noble Gases

When atoms ​ (a)   an electron, they gain +1 charge.

When atoms ​ (b)   an electron, they gain a -1 charge.

• lose
• gain