Atomic Theory

How are synthetic elements created?

• By heating elements

• By cooling elements

• By smashing atomic particles into a target element

• By mixing elements with water

Who started experimenting with a glass tube in 1870?

• William Crookes

• John Dalton

• Marie Curie

• Niels Bohr

What did William Crookes use in his experiments in 1870?

• A glass tube with a small amount of gas

• A metal rod with a large amount of gas

• A plastic tube with no gas

• A wooden stick with some liquid

What did Crookes theorize about the ray in the tube?

• It was a stream of particles

• It was a wave of light

• It was a flow of liquid

• It was a sound wave

What did JJ Thomson conclude about the ray?

• It was made of light

• It was made of sound

• It was made of charged particles

• It was made of water

During which century did scientists realize that all matter is made up of elements?

• 18th century

• 19th century

• 17th century

• 20th century

What did JJ Thomson's model picture?

• A sphere of negative charge equal to charge of nucleus

• A sphere of positive charge equal to negative charge of electrons

• A cube of positive charge neutralized by the nucleus

• A cube of negative charge neutralized by the nucleus

What year did Niels Bohr publish his model of the atom?

• 1905

• 1913

• 1920

• 1930

What is the relationship between atomic number and protons?

• Atomic number is the sum of protons and neutrons

• Atomic number is the number of protons

• Atomic number is the number of electrons

• Atomic number is the mass number minus neutrons

Which particle is not emitted during alpha decay?

• Gamma ray

• Alpha particle

• Proton

• Neutron