Which of the following is a polyatomic ion?

O A N₂

B. HCl

O C. S2

O D. PO43-

Which statement is true regarding a triation

A blank observation is when you describe something

Humans breathe through bronchi. Which structure do insects have for breathing? A. Skin B. Tracheae C. Lungs D. Gills

There are two different isotopes of bromine atoms. under normal conditions, elemental bromine consists of br2 molecules, and the mass of a br2 molecule is the sum of the masses of the two atoms in the molecule.

Which species is oxidized in the following reaction? N2O + H2 - > H2O + NH3 A) N+ B) H2 C) H+ D) N3

Rutherford calculated that a gold atom is about 10,000 larger than its nucleus. Thinking about his experiment and its results, how did he come to this conclusion?

Which atom in the ground state requires the least amount of energy to remove its valence electron? (1) lithium atom (2) potassium atom (3) rubidium atom (4) sodium atom

Which of the following is the correct Lewis structure for ammonia (NH3) ? Note: Hydrogen and nitrogen have one and five valence electrons respectively.

Which statement about the electron-cloud model is true? A. It is the currently accepted atomic model. B. it can easily be replaced by existing models C. It specifies the location and momentum of an electron. D.

To the nearest gram, what is the mass of one spoonful of sugar?