atoms and elements

Who was the Greek philosopher who said all matter is made of small particles that could not be divided?

• Democritus

• Rutherford

Which subatomic particle determines the identity of an element?

• Proton

• Nucleus

How many hydrogen atoms are in the compound, H2SO4?

• 1

• 2

• 3

• 4

What makes up the mass of the atom?

• protons and neutrons

• electron cloud

• neutrons and electrons

• electrons and protons

How many neutrons are in an atom with a mass number of 13 and 7 electrons?

• 7

• 13

• 6

• 20

Chlorine has atomic number 17 and mass number 35. How many protons, electron, and neutrons are in a chlorine atom?

• 18 protons, 18 electrons, and 18 neutrons

• 17 protons, 17 electrons, and 18 neutrons

• 18 protons, 18 electrons, and 17 neutrons

If the atomic number of an element is 10, how many protons are there?

• 20

• 4

• 10

• 5

What particles are in the nucleus of an atom?

• protons and electrons

• only protons

• neutrons and protons

Which statement is true about carbon dioxide (CO2) and carbon monoxide (CO)?

• Both compounds are harmless gases.

• Both compounds consist of the elements carbon and oxygen.

• Both compounds have all the same properties.

Who worked with Rutherford to discover neutrons?

• Thomson

• Chadwick

• Bohr