What is the difference between the number of electrons in an atom of selenium, se, and the number of electrons in an atom of aluminum, al?
a)21
b)17
c)8
d)14

A)21

Explanation:

To know the difference between the number of electrons in the two atoms, we must first know the number of electrons in the atoms.

For Selenium, Se, we have 34 electrons. The element is in group 6 on the periodic table.

Aluminum on the other hand is in the Boron family with a total of 13 electrons.

The difference,( 34-13) electrons gives a total of 21 electrons

they are made of gases.

they have a spherical shape.

they make energy through fusion.

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa