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periodic table crossword

Horizontales
Founded the electron
This elements atomic mass rounds to 108
1st group ; 2nd row
The atomic number of an element surrounded by dots that tell the number of valence electrons
The electrons on the last shell of an element
Has 10 neutrons
A model of an atom that shows its protons, neutrons, and electrons
Vertical lines of elements that tell the number of valence electrons in an element
Made up of protons and neutrons
Atomic symbol is Se
Verticales
Tells the number of protons and neutrons that are in the element
Neutrally charged
Has 4 valence electrons ; atomic number is 14
What the electrons in an atom orbit in
Negatively charged
An element that has metallic and non-metallic properties
Positively charged
Smallest level of matter
Elements that have 8 valence electrons
Substance made of a number of atoms
Horizontal lines telling the elements amount of shells