Question

using the periodic table, trace a stepwise path from hydrogen to the element below and give the electron configuration by specifying each of the periods (row), block (subshell), and the number of electrons (steps - superscripted) present. what is the electron configuration for br? 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 1s² 2s² 2p⁶ 3s² 3p³ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p³ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁴ question 21 1 pts which element has the following electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p² p ga as ga al

Explanation:

Step1: Recall electron - filling rules

Electrons fill orbitals in the order of increasing energy: 1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p etc. The s - subshell can hold 2 electrons, p - subshell can hold 6 electrons, and d - subshell can hold 10 electrons.

Step2: Determine electron configuration of Br (bromine)

Bromine has an atomic number of 35.

• First, fill the 1s orbital: 1s²
• Then 2s: 2s²
• Then 2p: 2p⁶
• Then 3s: 3s²
• Then 3p: 3p⁶
• Then 4s: 4s²
• Then 3d: 3d¹⁰
• Then 4p: 4p⁵. So the electron configuration of Br is 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵.

Step3: Determine element from electron configuration 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p²

• Calculate the total number of electrons.
• 2 (from 1s²)+2 (from 2s²)+6 (from 2p⁶)+2 (from 3s²)+6 (from 3p⁶)+2 (from 4s²)+10 (from 3d¹⁰)+2 (from 4p²)=32.
• The element with atomic number 32 is Germanium (Ge).

Answer:

1. 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵
2. Ge