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?

The element selenium has the atomic number of 34 while aluminium has atomic number of 13. The electronic configuration of selenium is 2, 8,18, 6 while that of aluminium is 2, 8, 3. This means that, selenium has six electrons in its outermost shell, this allows selenium to have variety of valence numbers. Aluminium on the other hand has only three electrons in its outermost shell. Aluminium will be more ready than selenium to give away its valence electrons in order to attain the octet form.  Selenium belongs to the group VIA while aluminium belongs to group IIIA. The group that an element belongs to determine the number of electron in its outermost shell.

Electrons are the sub-atomic particles of an atom. It has a negative charge and revolves around the positively charged nucleus.

The difference in the electrons of selenium and aluminum is that Se has 6 electrons in the outermost shell and Al has 3 in the outermost shell.

The difference in the electrons of Selenium and Aluminum is:

Selenium is the chemical element with the symbol Se and atomic number 34. The electronic configuration of Se is 2, 8,18, 6. The number of electrons in the valence shell of the selenium is 6. Selenium belongs to the group VIA. Aluminum is a chemical element with atomic number 13. The electronic configuration of the element is 2,8, 3. The number of electrons in the valence shell of aluminum is 3. Aluminum belongs to group IIIA.

Therefore, the number of electrons in the valence shell is different in Se and Al. Se has 6, while Al has 3 valence electrons.

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