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science chemistry 4

Amy King Science Inglés 10 fichas

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1What is the proton number?it can also called atomic number. This is the number of positive protons in each atom
2What is a nucleus made up of?The nucleus is found in the middle of at atom it contains protons and neutrons. it has a positive charge because of the protons.
3What is an electron?Electrons are what move around the nucleus in electron shells.
they are negatively charged. Electrons virtually have no mass.
4Why do neutral atoms have no charge?This is because they have the same number of protons and neutrons which has the same amount of opposite charge, which cancels it out.
5What is the mass number?Total of number of protons and neutrons.
6How did Dobereiner put elements into a group?by the chemical properties. The groups where put into three known as triads.
the middle element of each triad had a relative atomic mass that was the average of the other two.
7What are the electron shell rules?Electrons always occupy shells (energy levels)
The lowest energy levels are always filled first.
Only a certain number of electrons are allowed in each shell. (in the first shell their is only 2 and the rest only have 8)
8What periodic group is oxygen in?6
9What element does not have a group in the periodic table?Hydrogen
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Descripción: Science Fichas sobre science chemistry 4, creado por Amy King el 10/02/2017.
Creado por: Amy King
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