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☆☆☆☆☆Cards in this guide (9)
How many elements were there in 1860
63 elements had been discovered so far.
How is hydrogen in heavy water different from hydrogen in normal water
Type your answer here... The hydrogen atoms in heavy water have a neutron in the nucleus, doubling the mass.
What does the number above the symbol represent
The atomic number.
What do all atoms of any single element have in common
All atoms of any single element have the same number of protons and electrons.
What charge does an ion have if it has more protons than electrons
A net postive charge
What does adding a neutron to an atoms nucleus do to the atoms mass
we can not add neutron
What period is Zn (zinc) in
12
What is an isotope
Atoms of the same element that differ in number of neutrons
Na-23 has 11 protons. How many neutrons does it have
12
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