Question

An element Y has the proton number 18.
The next element in the Periodic Table is an element Z.
Which statement is correct?

Answer 1

Answer: An element Y has the proton number 18. The next element in the Periodic Table is an element Z. Which statement is correct? Element Z has one more electron in its outer shell than element Y

Explanation:

Answer 2

"It seems that this is what you are looking for"

An element Y has the proton number 18.The next element in the Periodic Table is an element Z. Which statement is correct?

1) Element Z has one more electron in its outer shell than element Y.

2) Element Z has one more electron shell than element Y.

3)  Element Z is in the same group of the periodic table as element Y.

4)  Element Z is in the same period of the periodic table as element Y.

Answer:

The element Z have one more electron shell in the comparison of element Y is the correct statement.

Therefore, the option (2) is correct.

Explanation:

• Given the atomic number of element Y is 18. It means element Y is Argon. The electronic configuration of Ar is [Ne] 3s²3p⁶.

• The next element is Potassium. Therefore, element Z is Potassium (K) with electronic configuration [Ar] 4s¹.
• Argon is present in group 18 and 3rd period while potassium is present in group 1A and 4th period. So the element Y and Z both present in different groups as well as different periods.
• The number of electrons in outer shell of element Y (Ar) is 8 while element Z (K) is 1.
• The element Z will have new principle quantum number n=4 as new electron shell is added.

Therefore, element Z has one more electron shell than that of element Y.