The element is Magnesium
- It has total 12 electrons
it has electronic configuration

or

In valence cell it has 2 electrons and therefore its valency is 2
First, by magnet separate paper clips.
Then, By handpicking, separate the pebbles.
Then, using a suitable sieve, separate toothpicks and toothpicks.
Answer: about 15 miles or exactly 15.53 miles
Explanation:
The answer would have to be d because heat rises