Match each element to the number of electrons in its valence shell.

Match Term Definition

Carbon (C) A) Two

Hydrogen (H) B) Six

Magnesium (Mg) C) One

Oxygen (O) D) Four

Carbon 2.8.2 - 2

hydrogen 1

magnesium 2.8.8.6 - 6

oxygen 2.8.6 - 6

Valence shell is outermost shell of an atom.

Atomic number of carbon is 6 and its electronic distribution is 2, 4.

Atomic number of hydrogen is 1 and its electronic distribution is 1.

Atomic number of magnesium is 12 and its electronic distribution is 2, 8, 2.

Atomic number of oxygen is 8 and its electronic distribution is 2, 6.

Therefore, each element is matched to the number of electrons in its valence shell as follows.

1. Carbon (C) - D) Four.

2. Hydrogen (H) - C) One.

3. Magnesium (Mg) - A) Two.

4. Oxygen (O) - B) Six.