Name the chemical elements, and also determine the charges of the nuclei of these atoms

Name the chemical elements, and also determine the charges of the nuclei of these atoms, knowing the distribution of electrons by energy levels: 2,8,7; 2.6; 2,8,1

To determine the elements, knowing the distribution of electrons by energy levels, you need to remember that: the ordinal number of an element in the periodic table is equal to the charge of the nucleus and the number of electrons that revolve around it.

1.2.8.7. There are 17 electrons in total, which means this is an element with atomic number 17 – Cl, the charge of the nucleus is +17.

2. 2.6. There are 8 electrons in total, which means this is an element in serial number 8 – O, the charge of the nucleus is +8.

3.2.8.1. There are 11 electrons in total, so this is an element with atomic number 11 – Na, the charge of the nucleus is +11.