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Atomic Structure Crossword

Horizontales
The number of protons in the nucleus of the atom.
Group 1 elements are known as ___.
Discovered the neutron.
Electrons are thought to be found here.
Discovered the proton.
Elements are arranged on the periodic table according to their ___.
Metals are on the __ side of the periodic table.
Arranged the elements according to increasing atomic mass.
Claimed that matter is made of fire, earth, water or air.
The particle with a one negative charge.
A negatively charged __ is formed when an electron is gained.
The horizontal rows on the periodic table.
Group 17 elements are called ___.
Verticales
Protons and __ are found in the nucleus.
First to propose that matter is made of small, indivisible objects.
Group 2 elements are __ metals.
The sum of protons and neutrons in an atom.
These are found between the metals and the nonmetals on the periodic table.
An atom of the same element that has a different number of neutrons.
Discovered the electron.
Group 18 elements are ___.
The particle with a one positive charge.
This was discovered by Rutherford
The vertical columns on the periodic table.