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- 1. Multiple Choice24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?74.92 amu24.97 amu75.01 amu74.51 amu - 2. Multiple Choice24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
How many protons does this element have?323334no way to know - 3. Multiple ChoiceA neutral atom of Carbon-13 has ________ electrons and _________ neutrons13, 136, 77, 76, 6
- 4. Multiple ChoiceIsotopes are atoms of the same element that have the same number of __________ but different number of __________ . Therefore, isotopes of the same element have different masses.protons, neutronsprotons, electronsneutrons, protonselectrons, protons
- 5. Multiple ChoiceIf neutral copper atom (atomic number 29) becomes an ion that has a charge of 2+, how many electrons does the resulting ion have?27282931
- 6. Multiple ChoiceIf a sulfur atom has 16 protons, 16 electrons, and 16 neutrons, its atomic mass is:16324864
- 7. Multiple Choice
which atom has 4 neutrons?Li-6Li-7Li-8they have the same # of neutrons - 8. Multiple ChoiceHow many neutrons does the isotope below have? 89 36Kr533689125
- 9. Multiple Choice
If X is the symbol for an element, which of the following two symbols represent isotopes of the same element?
1. 7735X
2. 7733X
3. 8137X
4. 8135 X
1 and 2
3 and 4
1 and 4
1 and 3
- 10. Multiple Choice
What results did Rutherford expect to see if the Plum-Pudding model is correct?
He expected that most of alpha particles would go through a gold-foil and small number of particles would deflect sightly
He expected that most of alpha particles would not go through a gold-foil and will stop on one side of a foil.
He expected that most of alpha particles would ricochet back after hitting a gold-foil
- 11. Multiple Choice
Choose one of the conclusions that Ernest Rutherford made based on the experimental results of his Gold-Foil experiment
He concluded that the atom is indivisible
He concluded that the atom is mostly empty space
He concluded that the atom has neutrons
He concluded that the atom is tightly packed with subatomic particles all mixed together
- 12. Multiple Choice
Based on the experimental results of his Gold-Foil experiment, Ernest Rutherford concluded that
The very dense center of the atom has a positive charge
The very dense center of the atom has a negative charge
The very dense center of the atom has no charge
The atom doesn't have a center and all particles are distributed evenly like in a chocolate chip cookie
- 13. Multiple Choice
Based on Rutherford's model of the atom, electrons in the atom are located
inside of the nucleus of the atom
outside and around the nucleus of the atom
outside and inside of the nucleus of the atom
- 14. Multiple ChoiceWhat contribution did John Dalton make to atomic theory?He discovered that every atom was positively charged.He discovered that every element consisted of one type of atom that couldn't be divided.He discovered that atoms had nuclei.He discovered that atoms could be divided into smaller parts.
- 15. Multiple Choice
What is the charge of silver with 46 electrons?
Ag+1
Ag-1
- Answer choicesTagsAnswer choicesTags