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)
Isotopes have different number…. But same number…
Different number neutrons
Same number protons
Masses of isotopes…
Differ
Most elements made up of how many isotopes
A mix
How isotopes represented?
Top number - mass number (nucleon number)
Bottom number - atomic number
Big letter - chemical symbol
Chemical reactions involve …
Electrons
Isotopes # electrons is…
The same
Does # neutrons have effect on reactions of an element?
No
Differences between isotopes can be in…
physical properties
Ion is…
A charged atom, #electrons different to # protons
