What is the mass number of an atom that contains 19 protons, 19 electrons, and 20 neutrons?

If the temperature of a piece of steel decreases, what happens to its density? a. The density decreases. b. The density increases. c. The density does not change. d. The density first increases, then decreases.

What's the compound name of h2c4h4o6

Fish give off the compound ammonia which has a pH about 7. To which class of compounds does ammonia belong?

Which statement is true about this reaction?

Which solution below most likely shows a vivid color? a. potassium chloride b. nickel chloride c. hydrogen chloride d. lithium chloride

Why is conductivity be the best test to find a metal, non-metal or metalloid?

In which way does a na1 + ion differ from a neutral na atom?

Which would not be associated with stable atmospheric conditions afternoon thunder showers is the answer

Which is not a characteristic of a compound? It is a mixture of elements. It has properties that differ from its component elements. It has a fixed proportion of elements.

Can you think of other possible ways scientists can determine what climate was like in the past besides studying ice cores?