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

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.