Concept two

Question 1

What is an atom?

Answer 1

consists of a nucleus made of protons and neutrons orbited by electrons

Question 2

What is an electron?

Answer 2

an invisible negatively charged particle that orbits the nucleus of an atom

Question 3

What is the nucleus?

Answer 3

positively charged center of an atom; contains protons and neutrons

Question 4

What is a valence electron?

Answer 4

the electrons on the outside electron shell

Question 5

What are electron shells?

Answer 5

they orbit of electrons around the nucleus of an atom

Question 6

What are protons?

Answer 6

positively charged particle in the nucleus of an atom

Question 7

What are neutrons?

Answer 7

neutral particle in the nucleus of an atom

Question 8

What is the atomic mass?

Answer 8

the mass of an element

Question 9

How do you calculate the atomic mass?

Answer 9

protons+neutrons

Question 10

What is a period?

Answer 10

the horizontal rows of elements in the periodic table

Question 11

What is a group?

Answer 11

the verticle colum of elements in the periodic table

Question 12

What is the atomic number of an atom?

Answer 12

the number of protons and electrons in an atom of an element

Question 13

what is an atomic mass unit?

Answer 13

how you measure the atomic mass of an element

Question 14

what are metals?

Answer 14

shiny, malleable, ductile elements that conducts electricity well

Question 15

What are metalliods?

Answer 15

elements that have both metallic and non- metallic properties

Question 16

what are non-metals

Answer 16

dull, brittle elements that do not conduct electricity

Question 17

What are alkaline metals?

Answer 17

group 1 elements in the periodic table, not including hydrogen; the most reactive of the metals

Question 18

what are alkaline-earth metals?

Answer 18

group 2 elements in the periodic table; their reactivity is not as strong as that of the alkali metals

Question 19

What are Halogens?

Answer 19

group 17 elements in the periodic table; the most reactive nonmetals

Question 20

What are noble gases?

Answer 20

group 18 elements in the periodic table; the most stable and unreactive elements

Question 21

How do you calculate neutrons?

Answer 21

atomic mass (rounded)-protons

Question 22

Who was John Dalton?

Answer 22

he put forth the first modern theory of atomic structure

Question 23

Who was J.J Thompson?

Answer 23

he discovered the electron and proposed the “rasin bun model”

Question 24

Who was Ernest Rutherford?

Answer 24

he discovered the nucleus

Question 25

Who was Niel Bohr?

Answer 25

he discovered electron shells

Question 26

Who was James Chadwick?

Answer 26

he discovered that the nucleus had positively charged particles called protons and neutral particles called neutrons

Question 27

Where did the word “chemistry” come from?

Answer 27

came from old Egpyt or Greece, meaning “pour together”