periodic

Question 1

periodic table

Answer 1

an arrangement of elements in columns, based on a set of properties that repeat from row to row

Question 2

mendeleev

Answer 2

chemist who developed the periodic table and organized elements by their properties while leaving empty spaces for more elements to be discovered

Question 3

element

Answer 3

a pure substance that cannot be broken down

Question 4

period

Answer 4

a row going across the periodic table

Question 5

group - family

Answer 5

a column going up and down on the periodic table

Question 6

periodic law

Answer 6

the pattern of repeating properties down each group in the periodic table

Question 7

chemical element/symbol

Answer 7

a one or two letter symbol that represents that name of an element
(first letter is capital and potential second letter is lowercase)

Question 8

atomic number

Answer 8

number of protons in an element,
atomic # is also equal to the number of electrons

Question 9

atomic mass

Answer 9

the number of protons and neutrons in the nucleus (center) of an element

Question 10

conductor

Answer 10

a material that allows things to flow

Question 11

metal

Answer 11

elements that are good conductors of heat and electric current

Question 12

nonmetal

Answer 12

elements that are poor conductors of heat and electric current

Question 13

metalloid

Answer 13

elements with properties that fall between those of metals and nonmetals

Question 14

noble gas

Answer 14

elements in group 18 which are unreactive and stable

Question 15

proton

Answer 15

particle with a positive charge, same amount as atomic number, this particle identifies the element

Question 16

neutron

Answer 16

a particle with a positive charge, same amount as atomic number, this particle identifies the element

Question 17

electron

Answer 17

a particle with negative charge , same amount as atomic number

Question 18

valence electron

Answer 18

electrons on the most outer shell

Question 19

orbital / shell / energy level

Answer 19

outer boundary of an atom, mostly empty space, each shell starting from the first shell can hold:
1st shell - 2 electrons
2nd shell - 8 electrons
3rd shell - 18 electrons
4th shell - 32 electrons

Question 20

nucleus

Answer 20

the center of an atom that contains neutrons and protons and therefore most of the mass

Question 21

chemical bond

Answer 21

a force of attraction between atoms to make them more stable

Question 22

ion

Answer 22

when atoms transfer electrons and become charged particles

Question 23

ionic bond

Answer 23

the force of attraction that holds together positive and negative ions, a transfer of electrons

Question 24

covalent bond

Answer 24

a force of attraction that holds together two atoms and shares electrons

Question 25

chemical formula

Answer 25

shows the elements involved in that molecule and the number of atoms of each element

Question 26

chemical equation

Answer 26

shows the molecules involved in a reaction
reactants show the ingredients and the products show the results