Electron theory
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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What is everything made of?
Molecules.
What is a molecule made of?
a nucleus containing protons and neutrons, the electrons will be moving around the nucleus
What is an atom made of?
an atom is made of protons orbitiing electrons.
What charge does a proton have?
Positive.
What charge does an electron have?
negative.
what charge does a neuron have?
a neutral charge.
How many protons and electrons are in a neutral atom?
The same ammount of protons and electrons.
What is the simplest atom?
Hydrogen with 1 proton and 1 electron.
What is the heaviest atom?
Uranium with 92 protons balanced by 92 electrons.
How many protons and electrons does the copper atom have?
29 protons and 29 electrons.
What is current?
The Flow of electrons.
How do electrons flow?
Negative to positive.
How does convectional current flow?
Positive to negative.
How is current measured?
Amps (A)
What makes a good condutor?
If there are free electrons in the outer shell.
What are materials with free electrons in good at?
they are good conductors.
What are materials with no free electrons in good at?
They are good insulators.
What makes a good insulator?
When there are no free electrons.
What is battery voltage known as?
Potential Difference (PD) measured in volts