2. Atoms & Elements

How many protons does a francium (Fr) atom have?

The identity of an element can be determined on the basis of which of the following?

Stars are made mostly of which two elements?

How many principal energy levels are present in a neutral sodium (Na) atom?

How many protons are present in a neutral atom of bromine (Br)?

Which of the following statements is most accurate regarding atoms?

What is the number of electrons in a neutral potassium atom?

In a water molecule (H₂O), which atom carries a partial positive charge?

Which of the following is considered the basic unit of chemistry?

Which of the following best explains why hydrogen and helium are the two most common elements in the universe?

Which term describes a chemical substance that cannot be broken down into simpler substances by chemical means?

Which type of scientist primarily studies matter and its composition?

Which element has more electrons in a neutral atom: hydrogen or uranium?

An electron and a proton are fixed at a separation distance of 1.0 nm. What is the magnitude of the electrostatic force between them?

Where is most of the mass of an atom located?