Consider the following elements
Na, Ca, Al, K, Mg, Li
Which of these element belong to the same period of the periodic table?

Open in App

Solution

Electronic configuration of all elements.
Na₁₁ 2, 8, 1
Ca₂₀ 2, 8, 8, 2
Al₁₃ 2, 8, 3
Mg₁₂ 2, 8, 2
Li₃ 2, 1

Period number is equal to the number of shells.
Elements that belong to the same group have the same number of shells.
From the above, we can see that sodium (Na), Aluminum (Al) and Magnesium (Mg) has 3 shells.
Therefore, sodium (Na), Aluminum (Al) and Magnesium (Mg) all belong to the 3rd period.
Conclusive statement
Sodium (Na), Aluminum (Al) and Magnesium (Mg) are the elements that belong to the same group.

Suggest Corrections

Similar questions

Consider the following elements :

Na, Ca, Al, K, Mg, Li

(a) Which of these elements belong to the same period of the periodic table?

(b) Which of these elements belong to the same group of the periodic table?

Q. 6. Which of the following elements belong to the same
(a) period (b) group
Na, Ca, K, Al, Mg, Li.

Mention the period to which Na,Mg and Al belong to. Justify their positions in the periodic table.

From the given elements: ${}_{20}{C a}, {}_{3}{L i}, {}_{11}{N a}, {}_{10}{N e}$ choose two elements belonging to the same group in the periodic table.

mention the period of the modern periodic table to which the mg and al belongs to? and why?

Join BYJU'S Learning Program

Consider the following elementsNa, Ca, Al, K, Mg, LiWhich of these element belong to the same period of the periodic table?

Consider the following elements
Na, Ca, Al, K, Mg, Li
Which of these element belong to the same period of the periodic table?