Science topic 1 lesson 1 and 2

Question 1

the smallest particle that still can be considered and element

Answer 1

atom

Question 2

an English chemist, made an Atomic Theory in the 1600s

Answer 2

John Dalton

Question 3

Facts that don’t change

Answer 3

laws

Question 4

The best explanation we have based on the evidence that we have

Answer 4

theory

Question 5

An atom is “invisible”

Answer 5

An atom is “invisible”

Question 6

atoms contain natively charged particles called

Answer 6

electrons

Question 7

An atoms is mostly empty space but has a dense positive charge at it’s core. This dense core is called the

Answer 7

nucleus

Question 8

a positively charged particle in an atom’s nucleus is an

Answer 8

proton

Question 9

Daltons model solid balls, Thompson’s model cookie dough ice cream(the cookie being the electrons), Bohr’s model electron rings (like planets and moons that orbit them), and the cloud model with is and electron cloud around the nucleus.

Answer 9

Daltons model solid balls, Thompson’s model cookie dough ice cream(the cookie being the electrons), Bohr’s model electron rings (like planets and moons that orbit them), and the cloud model with is and electron cloud around the nucleus.

Question 10

a particle that has no electric charge

Answer 10

neutron

Question 11

the nucleus includes neutrons

Answer 11

the nucleus includes neutrons

Question 12

Neutrons, protons, and electrons are knows as

Answer 12

subatomic particles

Question 13

Mass of a proton

Answer 13

1

Question 14

Mass of an electron

Answer 14

0 or 1/1,840

Question 15

Mass of a neutron

Answer 15

1

Question 16

an element is based on

Answer 16

it’s atomic number

Question 17

The number of protons in the nucleus of an atom is the

Answer 17

atomic number

Question 18

mass number=atomic number rounded off

Answer 18

mass number=atomic number rounded off

Question 19

atoms with the same number of protons and different numbers of neutrons are called

Answer 19

isotopes

Question 20

the sum of the protons and neutrons in the atom

Answer 20

mass number

Question 21

Dmitri Mendeleev , discovered a set of patterns that applies to all of the elements and made the periodic table which is

Answer 21

a chart showing all of the elements arranged according to the repeating pattern of their properties

Question 22

the average mass of all the isotopes of that element

Answer 22

atomic mass

Question 23

a one or two letter abbreviation for the element

Answer 23

chemical symbol

Question 24

rows in the periodic table are known as

Answer 24

periods

Question 25

the elements in the top row are the lanthanides. These elements are all found in nature and are sometimes called the

Answer 25

"rare earth metals"

Question 26

one characteristic that all actinides have in common is that hey are

Answer 26

radioactive

Question 27

Radioactive

Answer 27

an unstable element/ unstable nuclei

Question 28

scientists use the BLANK to make atomic nuclei move at extremely high speeds and can combine into a single nucleus

Answer 28

Particle accelerators

Question 29

group

Answer 29

family

Question 30

Alkali metals so reactive they are never found as free elements in nature.

Answer 30

Alkali metals so reactive they are never found as free elements in nature.

Question 31

Alkaline earth metals very reactive not as reactive as alkali metals also like alkaline metals are not found uncombined in nature

Answer 31

Alkaline earth metals very reactive not as reactive as alkali metals also like alkaline metals are not found uncombined in nature

Question 32

Transition metals are good conductors of heat and electric currents

Answer 32

Transition metals are good conductors of heat and electric currents

Question 33

Hydrogen has the simplest atoms and is rarely found on earth as a pure element but the sun is composed with hydrogen

Answer 33

Hydrogen has the simplest atoms and is rarely found on earth as a pure element but the sun is composed with hydrogen

Question 34

The Halogen family is highly radioactive and are known as "salt forming"

Answer 34

The Halogen family is highly radioactive and are known as "salt forming"