What happens to the number pf protons in an atom as you move across a period. The number of protons increase
The number of protons stay the same The number of protons decrease

A. The number of protons increase.

Explanation:

Each element rank is determined by the number of protons.

Hydrogen is #1 with 1 proton, Helium is #2 with 2 protons, Lithium is #3 with 3 protons, and so on.

a chemical reaction happens

explanation:

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.