Atomic Structure

Question 1

What did Robert Boyle propose?

Answer 1

1661 some substances could not be made simpler (chemical elements)

Question 2

What did John Dalton suggest?

Answer 2

Elements were made of indivisible atoms

All atoms of an element have same mass

Atoms could not be broken down

Question 3

What did Henri Becquerel discover?

Answer 3

radioactivity

Question 4

What did Henri Becquerel discover?

Answer 4

radioactivity

Question 5

What did JJ Thomson discover?

Answer 5

electron and plum pudding (sphere of positive charge with small negative charges distributed evenly within it)

Question 6

What did Ernest Rutherford find?

Answer 6

Most of the mass and positive charge of atom was in a tiny central nucleus

Electron shell model (scattering experiment)

Question 7

What does electrostatic forces of attraction do?

Answer 7

Hold electrons and protons together in the atom

Question 8

What is the definition of

Question 8

What is the mass number?

Answer 8

sum of protons and neutrons

Question 9

What is the atomic number?

Answer 9

number of protons

Question 10

What is the mass of electrons?

Answer 10

1/1840

Question 11

Definition of isotope?

Answer 11

atoms of the same element with the same number or proton but different number of neutrons

Question 12

What did Niels Bohr propose?

Answer 12

1913: shells of electrons orbiting positive nucleus

Question 13

What did James Chadwick discover?

Answer 13

1932: neutron

Question 14

What is the definition of relative atomic mass?

Answer 14

The mean mass of an atom of an element, relative to 1/12 of the relative atomic mass of Carbon -12

Question 15

What are the basic steps of Time of flight mass spectrometer?