1.

Question

(03.03 LC)

The element oxygen has
valence electrons. (Input only a whole number, such as 7.) (2 points)
2.
(03.03 LC)

Sulfur has fewer valence electrons than chlorine. (2 points)

True

False
3.
(03.03 MC)

Match the element with its number of valence electrons. (4 points)
1.
Boron
2.
Fluorine
3.
Carbon
4.
Sodium
a.
3
b.
4
c.
7
d.
1
4.
(03.03 MC)

How many valence electrons are in an atom with the electron configuration in example A?

Example A: 1s22s22p63s23p4 (3 points)

6

4

2

18
5.
(03.03 MC)

Which element is represented by the electron configuration in example B?

Example B: 1s22s22p63s23p64s1 (3 points)

Aluminum

Cesium

Potassium

Arsenic
6.
(03.03 MC)

Element A has one valence electron. How does its reactivity compare to that of element B, which has four valence electrons? (2 points)

Element A is more reactive.

Element A is less reactive.

Element A and B have the same reactivity.

Element A has no reactivity.
7.
(03.03 MC)

Which of the following elements is very reactive and needs to lose one electron to have a full outermost shell? (2 points)

Scandium

Cesium

Iodine

Xenon
8.
(03.03 LC)

The s subshell can hold up to two electrons in an atom. (2 points)

True

False

Answer 1

Here are the answers to your questions:

1. The element oxygen has 6 valence electrons.
2. False (Sulfur has 6 valence electrons, while chlorine has 7.)
3. • 1. Boron -> a. 3
   • 2. Fluorine -> c. 7
   • 3. Carbon -> b. 4
   • 4. Sodium -> d. 1
4. The number of valence electrons in the atom with the electron configuration 1s²2s²2p⁶3s²3p⁴ is 6.
5. The element represented by the electron configuration 1s²2s²2p⁶3s²3p⁶4s¹ is Potassium.
6. Element A is more reactive. (Elements with fewer valence electrons tend to be more reactive as they can lose them more easily.)
7. The element that is very reactive and needs to lose one electron to have a full outermost shell is Cesium.
8. True (The s subshell can hold up to two electrons.)