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atomic structure - Coggle Diagram
atomic structure
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Protons: mass =1, charge of + 1 in the nucleus
neutrons: mass = 1, the charge is neutral, found in the nucleus
electron: charge is negative, -1, mass is negligible, orbit in the shells
atomic number
it's the number of protons, which is also the same amount of electrons in an atom
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periodic table
groups
group 1
1 electron in the outer shell, so it's very reactive, reactivity increases down the group, (go down, more reaction)
group 7
7 electrons in the outer shell, react by gaining electron, reactivity decreases down the group, ( go down, less reaction)
group 0
outer shells are full, chemically aren't reactive, stable (boring)
periods
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eg. Nitrogen is in period 2, has 2 shells of electrons
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properties of elements
metals
properties: they are are thermal and electrical conductors, malleable (flexible), and ductile (can be pulled into a wire), generally quite dense, and solid at room temperature, high melting and boiling points
non metals
properties: thermal and electrical insulators, brittle (they can snap), can be solid, liquid, or gas, with low melting and boiling points, generally less dense than metals
