Which suffix means hardening?

Which suffix means tumor or mass?

Which combining form means nose?

Which of the following body cavities is a dorsal cavity?

Which of the following cavities is not a ventral cavity?

Which of the following suffixes means enlarged?

Which plane is the only horizontal plane?

The atomic mass of an element is equal to ________.

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

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 .