Question

13. Write the names of first four members of the halogen
family. Write their symbols in the order of
increasing atomic number. How are their melting
points expected to be related to their atomic
numbers?​

Answer 1

Answer:

The halogen elements are

• fluorine (F),
• chlorine (Cl),
• bromine (Br),
• iodine (I),
• astatine (At),
• and tennessine (Ts).

The size of the nucleus increases down a group

(F < Cl < Br < I < At)

because the numbers of protons and neutrons increase. In addition, more energy levels are added with each period. This results in a larger orbital, and therefore a longer atomic radius.

Answer 2

Explanation:

Group 17 Elements

The group 17 elements include fluorine(F), chlorine(Cl), bromine(Br), iodine(I) and astatine(At) from the top to the bottom. They are called “halogens” because they give salts when they react with metals. So, now you know what halogens are! Let’s now look at the electronic configuration of these elements.

group 17 elements

Electronic Configuration of Group 17 Elements

The valence shell electronic configuration of these electrons is ns2np5. Thus, there are 7 electrons in the outermost shell of these elements. The element misses out on the octet configuration by one electron. Thus, these elements look out to either lose one electron and form a covalent bond or gain one electron and form an ionic bond. Therefore, these are very reactive non-metals.