Which of the following diatomic molecules is joined by a double covalent bond?

O2

Cl2

N2

He2

What is the ratio of fe 3 ions to o2 - ions in a neutral compound? a. 1:2b. 2:1c. 2:3d. 3:2

Which of these elements has two electrons in its outer p orbitals? helium (He) barium (Ba) nitrogen (N) silicon (Si) sulfur (S)

Which part of modern atomic theory was first developed by John Dalton? A) Electrons are found in a cloud around the nucleus B) Atoms are rearranged during chemical reactions C) Atoms cannot be divided D) Electrons are spread through an atom

Which state of matter is highly compressible, is made of particles moving independently of each other, and is present in large quantities near Earth's surface?

How many atoms of each element does calcium sulfate, CaSO4, contain?

Extend E1 Explain why the arrangement, movement and energy of particles change during changes of state.

What is in a banana? give me specifics?!

Addition of an excess of lead (II) nitrate to a 50.0mL solution of magnesium chloride caused a formation of 7.35g of lead (II) chloride precipitate. What was the molar concentration of chloride ions in the solution (in mol/L) ?

2.70 L of a gas has a pressure of 0.63 atm. What is the volume of the gas at 105 kPa?

Which statements describe Rutherford's model of the atom? Select all that apply.