Carbohydrates are made up of carbon, hydrogen, and which term best completes the sentence?
a. oxygen
b. potassium
c. copper
d. helium

A. Oxygen

Step-by-step explanation:

Carbohydrates are made up carbon, hydrogen and oxygen. They usually have a hydrogen-oxygen ratio of 2:1, which is the same as water.

An easy way to remember what makes up carbohydrates is to just look at the name:

Carbo = carbon,

hyrdrates = water = hydrogen and oxygen

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.