Chapter 2 Atoms and elements

Question 1

What is an element

Answer 1

substance that cannot be broken down any further
substance containing atoms with the same atomic number or proton number

Question 2

Groups

Answer 2

Columns in the periodic table with groups of atoms with similar properties. Same number of valence electrons.

Question 3

Periods

Answer 3

Rows in the periodic table with the same number of electronic shells.

Question 4

Compounds

Answer 4

Made of different atoms and elements that have been bonded together

Question 5

Mixtures

Answer 5

Different substances that haven’t been bonded together

Question 6

Proton, neutron, electron mass and charge. What are these particles called

Answer 6

Mass: 1, 1, 0
positive charge, none, negative charge
Subatomic particles

Question 7

Proton number

Answer 7

Number of protons in a nucleus. aka atomic number

Question 8

Nucleon number

Answer 8

Mass number, total number of protons and neutrons of an atom.

Question 9

Electronic configuration

Answer 9

The arrangement of electrons in an atom.

Question 10

Electron shells

Answer 10

electrons are arranged in shells.

Question 11

Isotopes

how do properties differ

Answer 11

Atoms with the same protons and electrons, but a different number of neutrons. All the isotopes of one electron will have the same chemical properties

Question 12

Relative atomic mass

Answer 12

Average mass of its isotopes compared to 1/12th the mass of an atom of carbon-12

Question 13

what happens to the particles of a metal when it is hammered into shape

Answer 13

particles slide over eachother

Question 14

how does melting point of pure substance differ from impure

Answer 14

melts at a higher temp
sharp melting/specific melting point

Question 15

how does boiling point of a pure substance differ from impure

Answer 15

boils at a lower temp