What is the mass number of an element?
Unit 1: Atomic Structure and history

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•
Chemistry
•
9th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The mass number is the total number of protons and neutrons in the nucleus of an atom.
2.
FLASHCARD QUESTION
Front
How do you calculate the mass number of an element with 18 protons and 19 neutrons?
Back
Mass number = Protons + Neutrons = 18 + 19 = 37.
3.
FLASHCARD QUESTION
Front
What is the number of neutrons in Chlorine with a mass number of 35?
Back
Chlorine has 17 protons, so Neutrons = Mass number - Protons = 35 - 17 = 18.
4.
FLASHCARD QUESTION
Front
How many electrons does a neutral sulfur atom have?
Back
A neutral sulfur atom has 16 electrons, equal to its number of protons.
5.
FLASHCARD QUESTION
Front
What is matter?
Back
Matter is anything that has mass and takes up space.
6.
FLASHCARD QUESTION
Front
What are electrons?
Back
Electrons are subatomic particles that have a negative charge.
7.
FLASHCARD QUESTION
Front
What are protons?
Back
Protons are positively charged subatomic particles found in the nucleus of an atom.
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