2. Atoms & Elements

The atomic number of nitrogen is 7. What is the mass number of a nitrogen atom with 6 neutrons?

Hydrogen has three isotopes: 1H, 2H, and 3H. Which of the following names correctly matches the isotope 2H?

Which of the following is the number of neutrons in the most abundant isotope of iodine, iodine-127?

Cadmium has eight naturally occurring isotopes. What do these isotopes have in common?

An atom's mass number is 13 and its atomic number is 6. How many neutrons are in its nucleus?

How many protons does the isotope nitrogen-15 have?

Which of the following statements correctly describes isotopes of an atom?

Which statement is true about all uranium atoms?

Why do different isotopes of an element generally have the same physical and chemical properties?

What is the mass number of the isotope lithium-7?

Which of the following is the mass number of the isotope zinc-63?

How many neutrons are present in a typical lithium atom?

Which of the following is the correct nuclear symbol for the isotope of potassium with mass number 40?

Chlorine has two main isotopes: 35^{17}Cl and 37^{17}Cl. Which isotope is the most abundant in nature?

An atom of zinc has an atomic number of 30 and a mass number of 65. How many neutrons does this atom contain? Give your answer to the nearest whole number.