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☆☆☆☆☆Cards in this guide (10)
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 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
What happens to electrons in the photoelectric effect
When you shine a certain level of light wavelength on metal, you can knock electrons off the atoms of the metal. This phenomenon was explained by Albert Einstein in 1905, for which he received a Nobel Prize in 1921.
What makes up nearly all of the atom's mass
The nucleolus.
Sodium has 11 protons and 12 neutrons. What is its isotope notation
Na-23
Chlorine (Cl) has an atomic number of 17. It often forms an ion by gaining 1 electron. What would its charge be
-1
Na-23 has 12 neutrons what is its atomic number
11
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