Atomic structure | prep.1 | Ms. Shorouk Shaaban

.................. is the number of electrons or protons.

............. is the summation of the number of electrons and neutrons.

for the atom that has electronic configuration ,(2, 8, 9 2), the atomic number is ..............

for the electronic configuration , (2, 8,3), the atomic number is ...........

• 2

• 8

• 13

• 3

the electronic configuration of ( ₂₂Ti ) is .........

• 2, 8,8,2

• 2, 8, 10, 2

• 2, 8, 12

• no answer is correct

.................... is the number of electrons that the atom loses , gains or share with other atom during the reaction.

the valence number of the element that has electronic configuration ( 2, 8, 2) is .........

• zero

• two

• eight

• twelve

the valence number of the atom that has electronic configuration ( 2, 8, 8, 2) is .......

• +2

• +1

• -2

• -1

the valence number of ₁₁Na is ..........

• two

• five

• one

• zero

................ are the elements that tend to lose electrons.