Question

question 5 (1 point) what element is represented by 1s2 2s2 2p6 3s2 3p6 4s2? a be b sr c ca d mg

Explanation:

Step1: Count the total number of electrons.

The electron - configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}\). The sum of the superscripts gives the number of electrons: \(2 + 2+6 + 2+6 + 2=20\).

Step2: Identify the element based on the atomic number.

The atomic number of an element is equal to the number of electrons in a neutral atom. Calcium (Ca) has an atomic number of 20.

Answer:

c. Ca