Four students were asked to identify the number of valence electrons in an Argon (Ar) atom to help them determine the reactivity of the atom. Students were referred to group 18 to help them determine this. Student

# Of Valence Electrons in an Argon atom

Reactivity of an Argon atom

Student 1

1 v. e.

Reactive

Student 2

3 v. e.

Unreactive

Student 3

5 v. e.

Reactive

Student 4

8 v. e.

Unreactive

Which student identified the number of valence electrons and reactivity of Argon (Ar) correctly?

Refer to the Periodic Table

A.
Student 1

B.
Student 2

C.
Student 3

D.
Student 4

what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.

intermolecular forces are the forces between molecules or particles.

there are two kinds of van der waals forces: weak london dispersion forces and stronger dipole-dipole forces.

in molecule of water there are dipole-dipole forces between negatively charged oxygen from one molecule of water and positively charger hydrogen of another molecule of water.

hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (h), covalently bound to a highly electronegative atom such as flourine (f), oxygen (o) and nitrogen (n) atoms.