Valence Electrons

How many valence electrons does each atom of arsenic (As) have? Arsenic is element 33. It is in period 4 and family 15 (5A or the Nitrogen family).

5

Helium is in group 18 of the periodic table. How is helium different from the other elements in this group?

Helium atoms have 2 valence electrons, while atoms of the other elements in the group all have 8 valence electrons.

Which statement best describes the arrangement of electrons in an atom of fluorine (F)?

There are two electrons in the first energy level and seven electrons in the second energy level.

Two representative elements are in the same period of the periodic table. Which statement correctly describes the atoms of the two elements?

They have valence electrons in the same energy level.

Which element has atoms with valence electrons in a higher energy level than those of calcium (Ca)?

cesium