Question

arsenic is a metalloid. how many valence electrons does arsenic have?
6
5
4
3
question 8
1 pts
which of the following elements is a metalloid?
calcium
argon
tellurium
sodium

Explanation:

1. For the first question about arsenic's valence - electrons: Arsenic has an atomic number of 33 and its electron - configuration is [Ar] 3d¹⁰4s²4p³. The electrons in the outermost shell (4s and 4p in this case) are the valence electrons. 2 (from 4s) + 3 (from 4p) = 5.
2. For the second question about metalloids: Metalloids have properties intermediate between metals and non - metals. Calcium is a metal, argon is a noble gas, sodium is a metal, and tellurium is a metalloid.

Answer:

1. B. 5
2. C. tellurium