Chemistry

Question 1

1Write the s, p notation for carbon (Z = 6): ___

Hard

Your answer (fill in the blank)

Question 2

2The valence electrons of an atom are those

Easy

A. in the first shell B. that have no charge C. in the nucleus D. in the outermost shell

Question 3

3A 3d subshell can hold 10 electrons.

Medium

A. True B. False

Question 4

4How many electrons are in the ion Cl⁻ (atomic number 17)?

Medium

A. 16 B. 19 C. 18 D. 17

Question 5

5An atom of lithium has atomic number 3 and mass number 7. How many neutrons does it contain?

Easy

A. 7 B. 3 C. 10 D. 4

Question 6

6Isotopes of an element have the same chemical properties because they have

Medium

A. the same density B. the same mass C. the same electron configuration D. the same number of neutrons

Question 7

7Write the s, p notation for potassium (Z = 19): ___

Hard

Your answer (fill in the blank)

Question 8

8Electrons in the same orbital must have opposite spins.

Hard

A. True B. False

Question 9

9How many electrons are in the ion F⁻ (atomic number 9)?

Medium

A. 8 B. 10 C. 9 D. 11

Question 10

10Isotopes are atoms of the same element with

Easy

A. the same mass number B. different numbers of electrons only C. the same number of protons but different numbers of neutrons D. different numbers of protons