What is an atom?
- fundamental piece of matter, anything that can be physically touched
- everything in the universe, except energy, is made of matter
What are the particles that make up an atom, list their mass and charge?
- the subatomic particles that make up an atom are protons, electrons, and neutrons
- protons = positive charge, 1.67262158 x 10^-27 kilograms
- electrons = negative charge, 9.10938188 x 10^-31 kilograms
- neutrons = no charge
What is the size of an atom?
- difficult to describe because atoms have no definite boundry: around .1 nanomater, or 100 picometers
What is the shape of an atom, where are the particles?
- an atom consists of a central nucleus surrounded by a cloud of negatively charged electrons
- the atomic nucleus contains a mix of positively charged protons and electrically neutral neutrons
- very small particles/ waves
- are like light
- electrons bond
What are the characteristics of electrons?
- symbol = e
- nature = negatively charged
- relative charge = -1
- absolute charge = 1.6 x 10^-19 C
- relative mass = 1/1840 amu
- absolute mass = 9 x 10^-24 g
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