Question

Potassium, bromine and krypton are elements in period 4 of the periodic

table?

(a) In which group of the periodic table can these elements be found?

(b) Bromine exists as a molecule. Draw a electron dot structure to show

the bonding in a molecule of bromine.

(c) Krypton does not react with either potassium or bromine. Explain the

unreactive nature of krypton​

Answer 1

1. Groups of Modern Periodic Table in which these elements can be found:

• Bromine : Group 17
• Potassium : Group 1
• Krypton : Group 18

2. Bromine exists as a molecule containing 2 atoms of bromine. Electron dot structure is given in the attachment.

3. Krypton is a noble gas, that means it already has full-filled octet in its valence shell (4s² 4p⁶ : 8 electrons in valence shell), hence, it is already in its most stable form.

$\boxed{\bf Krypton: [Ar]\:3d^{10}\:4s^{2}\:4p^{6}}$

That's why , krypton does not react with any other atoms, because lose/gain of electrons will lead to loss of the stability.

$\star$ Hope It Helps.

Answer 2

Explanation:

1. Groups of Modern Periodic Table in which these elements can be found:

Bromine : Group 17Potassium : Group 1Krypton : Group 18

2. Bromine exists as a molecule containing 2 atoms of bromine. Electron dot structure is given in the attachment.

3. Krypton is a noble gas, that means it already has full-filled octet in its valence shell (4s² 4p⁶ : 8 electrons in valence shell), hence, it is already in its most stable form.

\boxed{\bf Krypton: [Ar]\:3d^{10}\:4s^{2}\:4p^{6}}Krypton:[Ar]3d104s24p6

That's why , krypton does not react with any other atoms, because lose/gain of electrons will lead to loss of the stability.