2. Atoms & Elements

How many hydrogen atoms and how many oxygen atoms are present in a single molecule of water (H_2O)? (Choose the correct pair of numbers for hydrogen and oxygen atoms, respectively.)

If an element has 6 protons, which element is it?

Which part of the atom carries a positive charge?

Where are the electrons located in an atom?

Which element has an atom with 100 protons in its nucleus?

How many protons are present in a neutral atom of cobalt?

Which of the following best completes the statement: The smallest unit of matter is a(n) ________.

By far the most abundant element in the giant (Jovian) planets is:

Which of the following is the number of protons in a neutral atom of cobalt (Co)?

Iron is an essential component of which biological molecule responsible for oxygen transport in the blood?

Which of the following did Antoine Lavoisier incorrectly characterize as matter?

How many protons are present in an atom of lead (Pb)?

A neutral atom of astatine contains how many electrons?

Which of the following is the smallest part of an element that still retains the properties of that element?

Which of the following is the mass number of the most common isotope of boron?