atoms consist of protons, neutrons, and electrons Flashcards
1
Q
how do elements differ?
A
elements differ in their number of protons, neutrons, and electrons
2
Q
helium has how many protons, neutrons, and electrons?
A
2 protons, 2 neutrons, 2 electrons
3
Q
carbon has how many protons, neutrons, and electrons??
A
6 protons, 6 neutrons, 6 electrons
4
Q
neutrons and protons are packed in the atom’s what?
A
nucleus
5
Q
the negative charge of electrons and the positive charge of protons keep electrons near what?
A
near the nucleus
6
Q
the number of protons is the atom’s what…?
A
atomic number
7
Q
mass number
A
the sum of protons and electrons in the nucleus
8
Q
all atoms of an element have the same atomic number, some differ in mass
A
this is true
9
Q
what are isotopes?
A
have the same numbers of protons and electrons but different numbers of neutrons
