Periodic Table Quiz 25 ?'s

Which particles in atoms have a negative charge?

• electrons

• protons

• neutrons

• positrons

In an atom, the number of protons equals the number of __________?

• neutrons

• electrons

• isotopes

• positrons

Which scientist inferred that an atom's positive charge is in the nucleus?

• Bohr

• Dalton

• Rutherford

• Thompson

Sodium has 11 protons, 12 neutrons, and 11 electrons. What is the mass number?

• 11

• 12

• 23

• 22

Sodium has 11 protons, 12 neutrons, and 11 electrons. What is the atomic number?

• 11

• 12

• 22

• 23

If an atom has 15 electrons, how many protons will it have?

• 5

• 10

• 20

• 15

Mendeleev created the first periodic table by arranging the elements in order of __________________?

• increasing melting point

• increasing atomic mass

• increasing atomic number

• increasing boiling point

How did chemists change Mendeleev's periodic table?

• included physical properties like density

• included chemical properties like flammability

• used atomic number instead of atomic mass

• used atomic mass instead of atomic number

The sun is made mostly of what element?

• Helium

• Hydrogen

• Oxygen

• Carbon

What info on the periodic table tells you the number of protons in an atom?

• symbol

• atomic mass

• atomic number

• chemical symbol