Question

When moving across a period from left to right in the periodic table, excluding transitions elements, which trend occurs? (1 point)

A. Valence electrons increase by one.
B. The energy levels decrease by one.
C. The energy level increases by one.
D. valence electrons decrease by one.

Answer 1

Let's look at the number of electrons in the element beginning with Li and moving to Ne in period 2.
Li = 1; Be = 2; B = 3; C = 4; N = 5; O = 6; F = 7; Ne = 8
What about beginning with H and ending with He in period 1.
H = 1; He = 2
What about period 3 beginning with Na and ending with Ar
Na = 1; Mg = 2; Al = 3; Si = 4; P = 5; S = 6; Cl = 7; Ar = 8
So what do you think?

Answer 2

Valence electrons increase by one

Answer 3

Aoki is correct

Answer 4

Dude is correct

Answer 5

bro is correct

Answer 6

poor dr.bob was just tryna explain lmao