10 Questions
The word atom comes from the Greek word atomos, meaning '_____.'
indivisible
Protons carry a positive electrical charge, while neutrons carry no electrical charge. Together, protons and neutrons are called ______.
nucleons
Every atom is associated with a specific ______ element.
chemical
An atom is the smallest unit of an ______.
element
The ancient Greeks were the first to think of the atom as the basic unit of all ______.
matter
Hydrogen has an atomic number of ______ because every hydrogen atom has one proton in its nucleus.
1
The mass number is equal to the total number of protons and ______ in an atom.
neutrons
Atoms that have the same atomic number but different mass numbers are called ______.
isotopes
An ordinary atom has an equal number of protons and ______.
electrons
If a neutral atom loses an electron, it becomes a ______ ion.
positive
Learn about atoms, the basic building blocks of all matter, and their structure. Discover how atoms can combine to form molecules and the origins of the word 'atomos.' Explore the history of how scientists began to understand the workings of atoms in the early 1800s.
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