atomic stuture Flashcards
1
Q
chemistry definition
A
the study of matter (made of atoms)
2
Q
nucleus
A
protons and neutrons exist in dense core at the centre of atom
3
Q
shells
A
electrons spread out around edge of atom, they orbit the nucleus
4
Q
the number of protons in an atom is known as…
A
the atomic number or proton number (Z)
5
Q
mass number
A
the sum if the protons and neutrons in an atom necleus (A)
