radioactivity Flashcards
page 66 (7 cards)
1
Q
what does the nucleus of an atom contain?
A
protons and neutrons.
2
Q
what is the atomic number for a nucleus?
A
number of protons in the nucleus
3
Q
what is the mass number for a nucleus?
A
number of protons and neutrons in a nucleus
4
Q
are electrons positively or negatively charged?
A
negatively charged
5
Q
atoms are neutral so..?
A
the number of protons= the number of electrons
6
Q
what are isotopes?
A
atoms with the same number protons but a different number of neutrons
7
Q
A
