An atom’s mass number is 200 and its atomic number is 80. How many neutrons does the atom have?

Think about a metal desk and a pencil. What do these two objects always have in common?

Which of the following scientists added negatively-charged particles to the model of the atom?

Beryllium is an element. What is the smallest particle of Beryllium that has all the chemical properties of calcium?

Where is the nucleus located in the atom?

What does a box on the periodic table represent?

What type of element are semiconductors?

Which describes how elements are arranged in the periodic table?

Which are properties of metals?

Which of the following is not made up of atoms?

What is the atomic mass of an atom that has 6 protons, 6 electrons, and 7 neutrons?

The current model of the atom shows electrons in a cloud surrounding the nucleus. How does the electron cloud model differ from the Bohr model?

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