2.1 Flashcards
Subatomic particle abbreviations
p+, n, e-
Relative charge on proton
1+
Relative charge on electron
1-
Relative charge on neutron
0
Relative mass proton and neutron
1
Relative mass electron
1/1836
Nearly all atom’s mass is in…
Nucleus
Number of protons equal to…
Number electrons, and atomic number
Why is atom neutral charge?
Total + charge of protons cancelled out by total — charge on electrons
Overall charge on atom
0
Neutrons can be thought of as…
Glue keeping protons together (as positive charges repel, so need to be held together)
Number of neutrons in an atom…
Same number/slightly more than number of protons - larger the nucleus, more protons needed
Atomic number shows
Number of protons (and electrons in a normal atom)
Atomic number of atoms in same element…
Is the same
Periodic table lists elements in order of…
Number of protons in nucleus (atomic number)
