Atom Test

Question 0

Average atomic mass

Answer 0

The mass of the elements isotopes, waited according to the abundance of each isotopes

Question 1

Atomic number

Answer 1

The number of protons in an element

Question 2

Ions

Answer 2

And atom that is no longer neutral because it has gained or lost electrons

Question 3

Isotopes

Answer 3

Adams of the same element that have different number of neutrons

Question 4

Mass number

Answer 4

The sum of the number of protons and neutrons in and atom.

Question 5

Protons

Answer 5

And atomic particle that has one positive charge

Two up and one down quark

Question 6

Nucleus

Answer 6

Most of an atoms mass and positive charge is concentrated in a small area in the center of the atom

Question 7

Electron

Answer 7

A particle with one negative charge

Question 8

Nuclear decay

Answer 8

A process that occurs when an unstable atomic nucleus changes and do another more stable nucleus by emitting radiation

Question 9

Alpha decay

Answer 9

Made up of two protons and neutrons, causing the atomic number to decrease by two

Two fewer protons two fewer neutrons

Question 10

Beta decay

Answer 10

A neutron and and atom changes into a proton and a high energy electron called a beta particle causing the atomic number to increase by one as it gains a proton

One fewer neutron and one more proton

Question 11

Gamma decay

Answer 11

Do not contain particles, but energy

Gamma rays can pass through things sheets of lead

Does not change one element into another

Question 12

What is a STM used for

Answer 12

A scanning tunneling microscopeis an instrument used for imagingsurfaces at the atomic level

Question 13

Democritus

Answer 13

He felt that all matter is made of small, solid objects that cannot be divided, created, or destroyed

Question 14

Aristotle

Answer 14

They were the more popular idea- that all matter is made up of fire, water, air, and earth

Question 15

Dalton

Answer 15

Revisited the idea of Adams. He made careful observations and measurements of chemical reactions and combine data from his own scientific research with data from the research of other scientist to proposed atomic theory.

Question 16

Thomson

Answer 16

Do experiments he discovered that an atom contained both positive and negative charges. These charges had mass and or even smaller than atoms. He’s been constructed a model of an atom. Chocolate chips and cookie dough

Question 17

Rutherford

Answer 17

Concluded that there is a nucleus and there were positively charged particles and the negatively charged electrons move the empty space surrounding the nucleus

Question 18

Chadwick

Answer 18

Discovered neutrons

Question 19

Bohr

Answer 19

He felt that electrons move in cellular orbits around the atom. When the electrons move from a higher energy level to a lower Energy level Energy is released as light. Electrons are not arranged and orbits