Objective: What are the basic components of an atom?

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Watch the video clip, answer the following question- Why do we study chemistry in biology?

Matter: Anything that occupies space and has mass

Element: Pure substance that cannot be broken down into other substances

Ex: Carbon (C), Hydrogen (H), Gold (Au)The elements that are found in all living things are:

carbon (C), oxygen (O), hydrogen (H), nitrogen (N)

Compound: 2 or more elements chemically combined

Ex. Carbon dioxide(CO2), water(H2O)

Atomsatom: smallest possible particle

of an elementParts of the atom (subatomic particles)Nucleus: central core of atom that contains

protons: single unit of positive electrical charge (+) neutrons: electrically neutral = no charge

Outside of the nucleus:Electrons: single unit of negative electrical charge (-)

located outside of the nucleus

Atomic number: number of protons in an atom– Differentiates elements

Atomic Number and Atomic Weight

Atomic Weight (Mass number): # of protons + # of neutrons

Carbon Potassium

Atomic Weight (Mass number): # of protons + # of neutrons

Protons electrons

protons neutrons

Symbol

Element

Atomic #

Atomic mass