For example, lithium atom contain 3 protons. The atomic number of lithium is 3. Any type of atom that has 3 protons have to be a lithium atom.

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Putting that in symbolsWe can show this information around an atom using its symbol and also atomic number:lithium(The symbol because that lithium is Li - note it starts v a funding letter back its name, lithium, starts v a small letter.)The atom number is created to the left the the symbol.

lithiumn nucleus interactive graphicPicture 2.2 Lithium has actually 3 positve proton in the nucleus. However, a lithium atom is neutral due to the fact that there are 3 an unfavorable electrons external the nucleus.Neutral atomsA neutral lithium atom will likewise have 3 electrons. The negative electrons balance the charge of the optimistic protons in the nucleus. Although the is the variety of protons that determines the element, the number of electrons will always be the same as the atomic number in a neutral atom.

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Neutrons and also isotopesThe nucleus of every lithium atom has actually 3 ptotons. However, the variety of neutrons deserve to vary. This gives rise to different isotopes (see pages 8 and also 9).

Question 6Look at the signs below. In each case, decide on the missing information and form it right into the space.a) nitrogeni. Number of protonsii. Atom numberb)heliumnumber the electrons(in neutral atom)c)XThe symbol for the elementrepresented through Xd)oxygenThe amount of positive charge in the nucleusplease choose02468navigation bar