"if an electrically neutral atom has 4 protons and 4 neutrons and it gains 2 electrons, what is its electrical charge? "

i think it's +2 but i know electrons are negative charges so guess it might be -2?

Explanation:

When an atom is neutral then number of protons equal number of electrons. Therefore, a neutral atom with 4 protons and 4 neutrons will also have 4 electrons.

It is known that when an atom gain electrons then it acquires a negative charge and when an atom loses electrons then it acquires a positive charge.

Therefore, when the given neutral atom gains 2 electrons then it will acquire a negative charge.

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

"the periodic table is arranged in order of atomic number."