Which suffix means tumor or mass?

Which suffix means hardening?

Which combining form means to cut?

Which prefix means outside of?

Which plane is the only horizontal plane?

Consider neutral atom which has 30 protons and 34 neutrons. The atomic number of the element is . The mass number for this atom is . The number of electron is . The symbol of element is , and its name is .

Atoms of different elements have always different number of in their nuclei.

The atomic mass of an element is equal to ________.

The smallest particle of an element that retains the characteristics of the element is a(n) .

The symbol of noble gas in the fifth period in Periodic table is