top of page

Which part of a calcium atom in the ground state is represented by the dots in its Lewis electron- d

January 2020 NY Regents Chemistry Exam


9 Which part of a calcium atom in the ground state is represented by the dots in its Lewis electron- dot diagram? (1) the electrons in the first shell

(2) the electrons in the fourth shell

(3) the protons in the nucleus (4) the neutrons in the nucleus


Solution: Dots in the Lewis electron- dot diagram represent valence electrons (electrons in the outermost shell). Looking at the Periodic Table, we see that the electron configuration for calcium is 2-8-8-2. This means it has 2 electrons in the first shell, 8 in the second shell, 8 in the third shell and 2 in the fourth shell. It must have 2 valence electrons in the fourth shell.

Answer: 2


Prepare for the Chemistry Regents Exam: HERE

Contact us for chemistry tutoring: HERE

0 comments

Commentaires

Noté 0 étoile sur 5.
Pas encore de note

Ajouter une note

Ready For Chemistry Tutoring?

I tutor all levels of chemistry including general and organic chemistry.

Click To Learn More

What subject are you taking?
Regents Chemistry
General Chemistry
Organic Chemistry

Join our email list 

bottom of page