Question

1. This element has 12 electrons when the atom is electrically neutral.

2. This element is an alkaline-earth metals group. It has 20 protons.
3. This element has 7 electrons when the atom is electrically neutral.
4. An isotope of this element has 8 neutrons and a mass of 14.
5. This element has a chemical symbol Hg.
6. This element belongs to the same group as aluminum (Al) and has an atomic mass of 69.72.

Answer 1

1. Magnesium(Mg)

2.Calcium(Ca)

3.Nitrogen(N)

4.Carbon(C)

5.Mercury(Hg)

6.Gallium(Ga)

Step-by-step explanation:

1.Neutral means same no. of protons and electrons which is atomic number.So element with Atomic number 12 is Magnesium.

2. No. of protons = Atomic number.So element with Atomic number 20 is Calcium.

3.Neutral means same no. of protons and electrons which is atomic number.So element with Atomic number 7 is Nitrogen.

4.C-14 isotope has two extra neutrons making it 6+2= 8 neutrons.

5.Mercury(Hg) is the name of element.

6.Gallium(Ga) and Aluminium together belongs to Aluminium family.