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Science 5: c9:L2
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Can we create new elements, or are they all found in nature?
Some elements are found in nature, but scientists can also create new ones in labs using special machines.
Why do scientists give each element a symbol, like H for hydrogen or O for oxygen?
Symbols make it faster and easier to write and understand elements.
what are most common elements in space?
Hydrogen and helium
Who created the periodic table?
Dmitri Mendeleev
How to call the number of protons in an atom?
the atomic number
How many known element are there in the world?
118 elements
What is made up of two or more atoms that are joined together?
molecule
The particle in an atom that has no charge
neutron
The particle in an atom that has a negative charge
electron
The smallest unit of an element ( building block of things)
atom
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