Isotopes

Which of the following is NOT true for the atoms ¹³N, ¹⁴N, and ¹⁵N? A) They all have the same mass number. B) They are isotopes. C) They all have the same atomic number. D) They all have 7 protons. E) They all have 7 electrons.

They all have the same mass number.

True or False ¹¹⁸Sn₅₀ has 68 neutrons.

True

True or False A sodium atom with mass number 23 has 12 neutrons.

True

Give the number of neutrons in a nitrogen atom with mass number 15.

eight

Atoms with the same atomic numbers but different mass numbers are called ________.

isotopes

Give the number of neutrons in a neon atom with one more proton than the number of neutrons.

nine

Give the number of neutrons in an oxygen atom whose mass number is 15.

seven

Give the number of neutrons in a carbon atom with the same number of protons and neutrons.

six

Give the number of neutrons in a fluorine atom with mass number 19.

ten

Isotopes are atoms of the same element that have A) different atomic numbers B) the same atomic numbers but different numbers of protons C) the same atomic numbers but different numbers of electrons D) the same atomic number but different numbers of neutrons E) the same atomic mass but different numbers of protons

the same atomic number but different numbers of neutrons

Consider an isotope of sodium with a mass number of 25. The number of neutrons in this isotope of sodium is A) 11 B) 14 C) 16 D) 25 E) 36

14

An atom of manganese with a mass number of 56 has ________ neutrons in its nucleus.

31

A sample of chlorine has two naturally occurring isotopes. The isotope Cl-35 (mass 35.0 amu) makes up 75.8% of the sample, and the isotope Cl-37 (mass = 37.0 amu) makes up 24.3% of the sample. What is the average atomic mass for chlorine? A) 36.0 amu B) 35 amu C) 36.6 amu D) 35.5 amu E) 35.521 amu

35.5 amu

What is the mass number of an atom of potassium that has 20 neutrons? A) 15 B) 19 C) 35 D) 39 E) 59

39

True or False ¹¹⁸Sn₅₀ has 68 electrons

False

True or False Isotopes have the same mass number but different number of protons.

False

The correct symbol for a uranium atom with a mass number of 235 is A) ²³⁵U₉₁ B) ³²⁷U₉₂ C) ¹⁴³U₉₂ D) ²³⁵U₉₂ E) ²³⁵Ur₉₂

²³⁵U₉₂

The correct symbol for the isotope of carbon with an atomic mass of 14 is A) ¹⁴C₈ B) ¹⁴C₆ C) ¹²C₆ D) ⁸C₆ E) ¹²C₈

¹⁴C₆

The correct symbol for the isotope of potassium with 22 neutrons is A) ⁴¹K₁₉ B) ¹⁹K₄₁ C) ³⁷P₁₅ D) ¹⁵P₃₇ E) ²²K₁₉

⁴¹K₁₉