Elements have three or fewer electrons on the outer energy level are classified as what?

Barium is an exception to the octet rule and will hold hold a maximum of four electrons in its valence shell. True or false?

What is the chemical nature of q-sepharose that allows it to be used as an ion exchanger?

What are the oxidation numbers of potassium, sulfur, and oxygen, respectively, in k2so4?

Its common allotropes are red and white

Given the balanced equation 2 (H2 S) + 3 (O2) = 2 (S O2) + (H2 O) What is the correct mole ratio set? H2 S: S O2 = 2:2, O2:H2 O 2:2, 3:2 2:3, 3:2 4:4, 5:4 4:6, 4:4

A sample of pure copper has a mass of 5 grams calculate its volume

Which statement best explains why carbon is present in so many kinds of molecules? Question 1 options: It is abundant on earth, so it is readily available to bond with other elements. It does not form strong bonds, so it breaks apart.

How long does it tae for bleach to evaprate?

What product (s) forms at the cathode in the electrolysis of an aqueous solution of k2so4?

What element is used as a shield to protect people from radioactive substances?