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8 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What was Dalton's theory |
He believed that atoms were hard spherical ball that can't be broken down. |
Hard ball |
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How did the Modern theory prove Dalton's theory wrong? |
The modern theory shows that atoms are in fact are made of subatomic particles which are known as Protons neutrons and electrons. |
Subatomic particles |
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Why are atoms overall nuetral? |
This is because atoms have the same amount of protons which have a positive charge and electrons with a negative charge. As they have the same amount they cancel each other out |
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How is a atom structured? |
In the centre of the atom there is a nucleus which contains protons and nuetrons and then there are shells which orbit around the nucleus which hold the electrons |
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How big is the nucleus and where is most mass contained in an atom? |
Nucleus is very tiny and most of the mass of a atom is in the nucleus. |
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What is the mass number and atomic number? |
The mass number is the over mass of a atom it is calculated by the addition of protons and nuetrons. Atomic number shows how many protons are in a element , often the smallest number in a element. |
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What is weird about tellerium And iodine |
Iodine has a smaller mass than tellurium but is placed after tellurium, this and a few other prove that Mendeleev philosophy didn't work for all the elements. |
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How did Mendeleev arrange the periodic table |
He arranged them in the form of increasing mass and their chemical properties |
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