Question

The electron configurations of two unknown elements X and Y are shown . X: 1s^ 2 2s^ 2 2p^ 6 3s^ 1 Y: 1s^ 2 2s^ 1 Which statement is most likely correct about the two elements ?

Answer 1

See below.

Step-by-step explanation:

They both have 1 valency electron so will be metallic and in the same Group (Group 1) of the Periodic Table, so will have similar properties.

Answer 2

This question is incomplete

Step-by-step explanation:

• X has an atomic number of 11 and hence it's sodium (Na) while Y has an atomic number of 3 and hence it is Lithium (Li).
• The atomic mass of X is 23 while that of Y is 7

• X has three electron shells while Y has two electron shells
• X and Y cannot form a compound as there ions are both positively charged (cations). However, there ions both have a charge of +1; hence are univalent positive metals.
• They are both metals and are found in group 1 of the periodic table
• The are highly reactive metals because they have just one electron in there outermost shell
• They react with halogens in group 7 to form salts
• They dissolve in water to form alkaline