Question

** ANSWER IS A** As you move from left to right across Period 3, which statement is true of the number of

valence electrons as you move from one main-group element to the next?
A. The number of valence electrons increases by 1.
B. The number of valence electrons decreases by 1.
C. The number of valence electrons increases by a multiple of 2.
D. The number of valence electrons decreases by a multiple of 2.

Answer 1

READ YOUR QUESTION CAREFULLY:

If it says left to right, the answer is A. The number of valence electrons increases by 1.

If it says right to left, the answer is B. The number of valence electrons decreases by 1.

Good luck :)

Answer 2

A. The number of valence electrons increases by 1.

Step-by-step explanation:

As you move across any period on the periodic table, the number of valence electrons increases by a value of 1.

• The periodic table of elements contains an arrangement of element by their atomic numbers.
• From left to right, number of valence electrons increases.
• Down a group, the valence electrons are the same.
• Across a period, the number of valence electrons increases.