Question

How many valence electrons does the element located in group 1, period 4 contain?
A. 1 B. 3 C. 7 D. 8
3. How many electron shells does Argon (atomic number 18) contain?
A. 7 B. 5 C. 3 D. 1
4. Which of the following elements is not metal?
a. Magnesium (12) b. Tungsten (74) c. Lithium (3) d. Krypton (36

Answer 1

1. A (1) — Group 1 elements (e.g., potassium in period 4) have one valence electron.
3. C (3) — Argon is in period 3, so it has three electron shells.
4. d Krypton (36) — Krypton is a noble gas (nonmetal); the others are metals.