ACROSS
1 This scientist proposed the solid sphere model of
the atom
5 The unit used to measure the mass of atomic
particles
6 The nucleus of an atom is massive, but has little
volume, which makes it very
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2 Protons and neutrons are in this part of an atom
3 This scientist proposed the plum pudding model of the
atom
4 Where electrons are found in an atom
8 This scientist identified the dense nucleus of atoms
7 The sum of the protons and neutrons in an atom
9 This scientist proposed that electrons orbit the nucleus
in a set path
11 A negatively charged particle in an atom
10 Atoms are measured on this scale
13 Schrodinger and Heisenberg said that we can't
tell where or how fast electrons are moving in an
atom. What principle is this?
12 The usual overall charge of an atom
16 This particle makes up protons and neutrons
17 When one type of atom has a different number of
neutrons than protons
18 The number of protons in an atom
19 A particle in an atom that does not have a
charge
14 An atom that carries a charge because it
has more or less electrons than protons
15 A positively charged particle in the
nucleus of an atom