Because they have equal numbers of protons and electrons
2 of 6
What is the atomic number and the mass number of an atom with 29 protons, 36 neutrons and 29 electrons?
Atomic number = 29, Mass number = 65
3 of 6
What is the name for atoms with the same atomic number but different mass numbers?
Isotopes
4 of 6
Why is the relative atomic mass of chlorine 35.5?
It is an average mass of the isotopes
5 of 6
Boron naturally exists as two isotopes, boron-10 and boron-11. The abundance of boron-10 is 20% and the abundance of boron-11 is 80%. Using these figures, what is the relative atomic mass of boron?
10.8
6 of 6
Other cards in this set
Card 2
Front
Why are most atoms neutral?
Back
Because they have equal numbers of protons and electrons
Card 3
Front
What is the atomic number and the mass number of an atom with 29 protons, 36 neutrons and 29 electrons?
Back
Card 4
Front
What is the name for atoms with the same atomic number but different mass numbers?
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