An atom has 25 protons, 30 neutrons and 25 electrons. what is the charge of the atom's nucleus?

The electron configuration of an element is 1s22s22p4. Describe what most likely happens when two atoms of this element move toward each other.

What determines the strength of a solute as an electrolyte?

As scientists search the universe for signs of life on other planets they are likely to focus on the presence of molecules containing which of the following elements? A. carbon B. calcium C. iron D. magnesium

How many F atoms are there in 0.035 mol CF4

What is the definition of "molecular compound?"

Calculate the volume of a 0.323-mol sample of a gas at 265 K and 0.900 atm.

What is the molar mass of the following substance : Cs2CO3

What does the velocity of a wave describe

Sulfur (S) has 16 protons and 16 neutrons. How many electron shells does an element of sulfur have?

Which one of the following statements about orbital energies is incorrect? A) The energy of a given orbital increases as the nuclear charge Z increases. B) In many-electron atoms the energy of an orbital depends on both n and l.