One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?
answer
18
question
What is true about all uranium atoms?
answer
They each have the same number of protons.
question
How many neutrons make up one of these potassium atoms?
answer
20
question
All atoms of the same element must have the same number of
answer
protons.
question
What must happen to an atom of magnesium in order to become a magnesium ion Mg+2?
answer
It must lose two electrons and become an ion.
question
How many electrons are in the third energy level?
answer
8
question
An atom that has fewer neutrons than protons and more electrons than protons is a(n)
answer
ion.
question
What is the name of this specific silicon isotope?
answer
silicon-32
question
Scientists are working with a liquid that is made of only one type of atom. Which statements correctly describe this liquid? Check all that apply.
answer
The liquid contains only one element.
The liquid is a pure substance.
question
One way in which elements differ from each other is the structure of the electron cloud in each element's atoms. In an electron cloud, an electron that is farther away from the nucleus has
answer
a higher energy than an electron near the nucleus.
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