How do the parts of an atom influence the elements?

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Presentation transcript:

How do the parts of an atom influence the elements?

Recap Atoms have a positively charged nucleus that contains both protons and neutrons. Electrons orbit around the nucleus in a “cloud”

What determines an Element? The number of protons inside an atom determine which element it is. 1 proton means Hydrogen. 2 protons means Helium. What element has 15 protons?

Atomic Charge Protons are + Electrons are – Neutrons are neutral An atom prefers to be neutral thus having a net charge of zero.

Atomic Number The number of protons in an atom.

Atomic Number 8 O 16 Atomic Number Oxygen has an atomic number of 8. What does that tell me about the number of protons it has?

Atomic Mass (Mass Number) The atomic mass is the total number of proton plus total number of neutrons inside an atom. Protons + Neutrons = Atomic Mass

Mass Number 8 O 16 Mass Number

How do we find the number of neutrons? Number of neutrons = Mass number – Atomic number OR Number of neutrons = (# neutrons + # protons) – (# protons) So….how many neutrons does Chromium (Cr) have?

How do we determine the number of electrons? Number of electrons = number of protons

Atomic Mass What is the atomic number, atomic mass, number of protons, number of neutrons, and number of electrons of the following element? 30 Zn 65.39

Isotopes An atom with the same number of protons and a different number of neutrons.