Atomic number of an element is 15 is it a metal or nonmetal

How can water and gravity work together to erode soil, sediment, and rock

Is the element krypton noxious?

What tools might be used to study a stink hole?

Which of the following elements has the largest atomic size? S, Ba, Po, Ca

For an isolated atom, why do we expect the number of electrons present in the atom to be the same as the number of protons in the nucleus of the atom?

If you change the state of something, say, liquid to solid, is it a physical or chemical change?

What type of calorimeter would be best to use if you wanted to measure the heat that is released when gasoline is burned?

Tina has a sample of gaseous water at a temperature of 400 C and a pressure of 4 atm. If Tina increases the pressure to 200 atm, will the gaseous water liquefy? Why or why not?

Label the molecular shape around each of the central atoms in the amino acid glycine. hint

Which has more atoms, 2moles of carbon or 2 moles of aluminum