Answer:

1.Iodine has 7 valence electrons in the valence shell which means that there are 7 electrons in its outer shell. A neutral iodine atom will have a total of 53 electrons around its nucleus. Out of these 53 electrons, some are known as valence electrons while others are known as core electrons.

2.Carbon is in Group 4A, so it has 4 valence electrons.

3.Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴.

4.Since the electrons are the outermost electrons in the third shell, silicone has four valence electrons. Hence, the number of valence electrons in silicon is four.

5.For example, fluorine has seven valence electrons, so it is most likely to gain one electron to form an ion with a 1- charge.

6.Magnesium has atomic number 12. Its electronic configuration is 2,8,2 . Thus, it has 2 valence electrons.