CH6.2.1 Using the Periodic Table

How many valence electrons does Ne have?

• 0

• 1

• 2

• 3

Answer explanation

Neon is a noble gas, so its outermost shells are completely full, thus having no valence electrons.

What is the energy level of valence electrons in Br?

• 1

• 2

• 3

• 4

Answer explanation

Bromine is in group 17 period 4. So, it's valence electrons (in p and s) are at the 4th energy level.

Write the electron configuration (using the condensed configuration) for Li.

• [He]

• [He]2s¹

• [He]2s²

• 1s¹

Which group, period, and block does [Ne]3s²3p¹ belong to?

• Group 1, Period 3, s-block

• Group 2, Period 3, p-block

• Group 13, Period 2, s-block

• Group 13, Period 3, p-block

How many valence electrons does Cl have?

• 1

• 2

• 7

• 8

What is the energy level of valence electrons in an atom N?

• 1

• 2

• 3

• 4

Write the electron configuration (using condensed notation) for F.

• [He]

• [He]2s³

• [He]2s²2p⁵

• [He]2s²2p⁶

Titanium is in period ​4 but its d-orbital electrons are in energy level

Answer explanation

Remember that for d-block elements, the energy level of the d-orbital electrons are in n-1.

How many valence electrons does B have?

• 1

• 2

• 3

• 4

What is the energy level of valence electrons in Ra?

• 1

• 2

• 6

• 7