How many valence electrons are in a lanthanum atom?

Answer 1

Lanthanum with atom number 57 and mass number 139 has:

57 protons, 82 neutrons (since 57+82=139) and 57 electrons.

La-138 has 81 neutrons (i.s.o. 82) with 57 protons and 57 electrons.

Answer 2

Most often 3. Some can also have oxidation states +2 and/or +4, and perhaps higher oxidation states.

Answer 3

Lanthanum (57La) has electronconfiguration [Kr] 4d10, 5s2 5p6 5d9, 6s2 , so it has 2 valence electrons and maybe sometimes 3, being the first transition 5d-block metal-element.

Answer 4

A lanthanum atom has 3 valence electrons.

Answer 5

Lanthanum has 57 electrons.

Answer 6

eight

Answer 7

121

Answer 8

57

Answer 9

3

Answer 10

57