atomic structure

Question 1

element definition

Answer 1

a substance that cannot be broken by any other substance

Question 2

atom definition

Answer 2

smallest part of the element that can exist with the same chemical properties

Question 3

circles around the atom

Answer 3

energy levels

Question 4

center of the atom

Answer 4

nucleus

Question 5

nucleus contains

Answer 5

protons and neutrons

Question 6

compounds definition

Answer 6

two or more elements that are chemically combined together

Question 7

atomic theory

Answer 7

idea that everything is made of tiny particles that can’t be broken down any more

Question 8

what did john Dalton suggest

Answer 8

that solid spheres have different types of spheres that make up elements

Question 9

what did jj Thomson make

Answer 9

Plum pudding model he suggests that they are not just solid spheres and they must contain negatively charged particles. He discovered electrons

Question 10

Ernest rutherford - gold foil experiment

Answer 10

Around the nucleus is a cloud of negative charge - nucleur model. He chose the name protons.

Question 11

Niels Bohr

Answer 11

electrons orbit the nucleus and held in shells which stop the atom from collapsing

Question 12

james chadwick

Answer 12

neutal particles in the nucleus = neutrons

Question 13

atoms are neutral

Answer 13

they have no overall electric charge

Question 14

number of electrons equal

Answer 14

number of protons

Question 15

top number

Answer 15

mass number

Question 16

bottom number

Answer 16

atomic number

Question 17

atomic number =

Answer 17

number of protons in an atom of an element

Question 18

mass number

Answer 18

number of protons + number of neutrons

Question 19

finding neutrons

Answer 19

mass number - number of protons

Question 20

isotope

Answer 20

element with the same number of protons but different numbers of neutrons