Question

What is the first step to determine the sequence of filling electron configurations of an element?

A. Find the elements location on the periodic table.
B.Use a diagonal diagram.
C. Add up all the exponents.
D. Add up all the coefficients.

Answer 1

A, find the location

"Locate the element on the periodic table and use the atomic number to determine the number of electrons in one atom. For example, locate carbon. Carbon is atomic number 6, so it has six electrons."

Answer 2

B

Step-by-step explanation:

You start from the highest energy level to the lowest. The arrangement is: 1s<2s<2p<3s<3p<4s<3d<4p<5s<4d<5p<6s<4f<5d<6p<7s<5f<6d<7p. Each box in the configuration can hold up to 2 electrons. This rule tells you to fill all boxes of one particular subshell with 1 electron first, before double occupying them.