Flashcards
Unit 3: Atoms
Cards in this deck (18)
- 1Isotopes What determines the identity of the element?number of protons
- 2Isotopes An element's isotopes will have the same (3 things)...1. Number of protons (atomic number)
2. Number of elections
3. Chemical behavior - 3Isotopes An element's isotopes will have different (2 things)...1. Number of neutrons (and mass number)
2. Masses - 4What is the symbol for an atom that has 18 protons, 18 electrons, and 22 neutrons? (Hint: you will need to use a periodic table)
- 5How do you calculate the average atomic mass?
- 6What does the mass of an atom depend on?The number of electrons, protons, and neutrons it contains.
- 7What does this number represent?The atomic mass
(weighted average of isotopes masses)
- 8Why do atoms of the same element have the same atomic numbers but different mass numbers?Same atomic number because the number of protons doesn't change.
The number of neutrons can change which can change the mass. - 9What information is needed to calculate an element's average atomic mass?The mass (amu) of the isotopes and the known abundance of the isotopes.
- 10What do you know about protons?Located inside the nucleus.
Have a +1 charge.
Has a mass of 1 amu. - 11What do you know about neutrons?Located inside the nucleus.
Has no charge.
Has a mass of 1 amu. - 12What do you know about electrons?Found in the empty space outside the nucleus.
Has a -1 charge.
Has essentially no mass. - 13Elements are arranged on the periodic table according to __________.their atomic number
- 14Why are atoms neutral?They contain an equal number of protons and electrons.
- 15What is an atom's mass number?The mass number represents the sum of the neutrons and protons in the nucleus.
(It's added after the element's name in an isotope...like Potassium-39) - 16How do you determine the number of neutrons in an atom?Mass number - atomic number =
# of neutrons - 17What are the writing symbols for atoms?
- 18What are the writing symbols for atoms (part 2)
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- 10th grade Chemistry Flashcards on Unit 3: Atoms, created by Jennifer Eckle on 14/11/2022.
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- Jennifer Eckle
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