If an atom has 34 protons and 40 neutrons, what is its mass number?

An atom of copper is represented by 6529cu. how many neutrons are in the nucleus of this atom?

How many moles of nacl are present in 600 ml of a 1.55 m nacl solutions

Which compound will conduct electricity when it is dissolved in water? a. CH4 b. CuSO4 c. C6H6 d. C6H12O6

What is the primary difference between a hypothesis and a theory? A. A theory is supported by more data and observations than a hypothesis is. B. A hypothesis is falsifiable, but a theory has been proven to be correct. C.

In which location would a free neutron from a decaying U-235 atom be most likely to cause another atom to go split? A. In a sample of naturally occurring uranium B. In a sample of enriched uranium C. In a sample of rock or soil D.

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

Which sub-layer thins out into space, where there is no air

Complete and balance the molecular equation, including phases, for the reaction of aqueous ammonium bromide, nh4br, and aqueous lead (ii) acetate, pb (c2h3o2) 2.

A magnesium atom has 2 valence electrons in its third shell. Which is a TRUE statement about what happens when it forms an ion? A. It will be an anion. B. It will have more electrons than protons. C.

What scientific discoveries led to changes in Dalton's atomic theory?