2. Atoms & Elements

How many protons does a potassium atom have?

Which of the following best describes the difference between a molecule and an atom?

How many protons (p) are present in an atom of sulfur?

Which atoms combine to form a molecule of water?

Which of the following primarily determines an atom's chemical properties?

What is the atomic number of sulfur?

How many protons are present in a neutral atom of sodium (Na)?

How many protons are present in an atom of argon?

Since atoms are mostly empty space, which of the following best explains why solid objects cannot pass through each other?

Which of the following is the smallest unit of an element that retains its chemical properties?

Rutherfordium has an atomic number of 104. How many protons and electrons does a neutral atom of rutherfordium contain?

Which gas is most abundant in Earth's atmosphere?

Which type of electric charge is carried by a proton in an atom?

Which of the following is the smallest particle?

Which scientist described atoms as small, indivisible spheres that could not be divided into anything smaller?