Atom A has four electrons in its outer shell. In the vast majority of cases, an atom of this type will form bonds with other atoms. Select one: a. hydrogen bond b. sulfur bond c. ionic bond d. covalent

D; Covalent bond

Explanation:

Atoms with four electrons in their outer shell can  either lose four electrons to another atom or gain four electrons from another atom to fill its outer shell. They can only share electrons with other atoms in a covalent form since they cannot donate or accept electrons. The sharing of a pair of electrons between atoms is termed covalent bonding.

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 density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.