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Across
3.Atoms of the same _________ have the same amount of electrons in their outer shell.
7.Electrons are found in electron ______.
8.Rutherford’s version of the atom was comparable to the _______ ________.
12.__________ have the same atomic number but different mass number.
14.Chadwick discovered the _______.
15.The __________ has a mass of about 5.486 x 10^-4 amu.
17.Which atomic model did JJ Thomson make.
18.The outermost shell of an atom is the _________ shell.
19.An __________ atom has an electronic configuration of 2,6.
Down
1.Greek word the word atom came from.
2.________ particles were shot at foil in the gold foil experiment.
4.Atoms of the same period have the same amount of electron ________.
5.The _________ charge of an atom is found in its nucleus.
6.The __________ __________ arranges atoms by increasing atomic number.
9.________ is equal to the mass number – neutron number.
10.Who discovered the electron.
11.Argon-40 has 18 __________.
13.Charged atoms are __________.
14.99% of an atom’s mass is found in its _________.
16.The mass number is also known as the __________ number.

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