What contains more than one pair of electrons?

How reactive is an atom of Sodium (Na) and why? Sodium (Na) is not very reactive because it does not have a full valence shell. Sodium (Na) is not very reactive because it can only bond with Chlorine (Cl) to become salt.

How does the type of precipitation change currently?

Which of the following would be the most difficult to compress? A) oxygen B) water C) brick D) salt water

How many energy level does carbon have

Which is the equation of a circle with its center at (-4,2) and a radius of 4? Select one: a. (x+4) 2 + (y-2) 2 = 16 b. (x-4) 2 + (y+2) 2 = 16 c. (x-4) 2 + (y+2) 2 = 4 d. (x+4) 2 + (y-2) 2 = 4

Which of these is a property of bases? They produce hydrogen gas when reacted with metals. They turn litmus paper blue. They feel sticky. They taste sour.

After Pangaea broke up, North America became part of what?

What the different betwen observe and reference

How many moles are in 12.5 g of H2O

How do the atomic number and the number of protons relate to one another? The atomic number tells us the number of protons The atomic number is protons + neutrons They do not Electron Cloud