What are columns and rows called on the periodic table?

If an element is divided into smaller and smaller parts, the smallest particles obtained would be

Which statement is supported by the atomic theory?

An atom's mass number is 210 and its atomic number is 85. How many neutrons does the atom have?

If a basketball was used to model a proton, what would be used to model an electron?

Calcium is an element. What is the smallest particle of Calcium that has all the chemicals properties of Calcium?

Which of the following is not made up of atoms?

What is the mass number of an atom that has 4 protons, 4 electrons, and 5 neutrons?

Which group lists the parts of an atom from the most massive to the least massive?

Atoms are the building blocks of all matter. Which of the following are the building blocks of atoms?

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