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☆☆☆☆☆Cards in this guide (12)
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 did John Dalton publish
An early theory describing properties of atoms
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 does the group number of A elements in the AB numbering system tell about valence electrons
all the elements in group A has the same number of valence electrons
What does adding a neutron to an atoms nucleus do to the atoms mass
we can not add neutron
How were the elements arranged on his periodic table
Elements are arranged in the order of increasing atomic number in the modern periodic table.
what charge of an ion have if it had more electrons than protons
An ion that has more electrons than protons has a negative charge.
What makes up nearly all of the atom's mass
The nucleolus.
Na-23 has 12 neutrons what is its atomic number
11
What is an isotope
Atoms of the same element that differ in number of neutrons
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