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# Isotopes (Grade 10)

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## Isotopes

1.
If there are two elements with the same atomic number and a different number of neutrons, it is called a(n)                .
1. neuron
2. isotope
3. clone
4. ion

2.
An isotope of carbon is                .
1. boron-12
2. nitrogen-12
3. carbon-14
4. hydrogen-2
3.
Which symbols represent atoms that are isotopes?
1. C-14 and N-14
2. O-16 and O-18
3. I-131 and I-131
4. Rn-222 and Ra-222

4.
Which of the following would be an isotope of aluminum?
1. Atom A: mass number=24, atomic number=13
2. Atom B: mass number=24, atomic number=12
3. Atom C: mass number=26, atomic number=14
4. Atom D: mass number=22, atomic number=11
5.
Compared with $""^31"P"$, the radioactive isotope $""^32"P"$ has
1. a different atomic number
2. one more proton
3. one more electron
4. one more neutron

6.
Thallium has two isotopes, thallium-203 and thallium- 205. Thallium's atomic number is 81, and its atomic mass is 204.38 amu. Which statement about the thallium isotopes is true?
1. There is more thallium-203 in nature.
2. Atoms of both isotopes have 81 protons.
3. Thallium-205 atoms have fewer neutrons.
4. The most common atom of thallium has a mass of 204.38 amu.
7.
A certain isotope of sodium has a mass number of 23. How many neutrons does it have?
1. 14
2. 34
3. 23
4. 12

8.
Which of the following pairs shows isotopes of the same element?
1. $""_6 ^12C and ""_6 ^12C$
2. $""_6 ^14C and ""_7 ^14N$
3. $""_6 ^14C and ""_6 ^12C$
4. $""_6 ^14C and ""_6 ^14C^-4$
9.
What are isotopes? How are isotopes of particular element alike, and how are they different?

10.
Antimony has two naturally-occurring isotopes, Sb-121 and Sb-123. Sb-121 has a natural abundance of 57.2%, while Sb-123 has a natural abundance of 42.8%.

In the space provided below, write the isotopic notation for the isotope of antimony with the greater percent natural abundance.

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