C1 Triple: Atomic structure

Question 1

nuclear model

Answer 1

Model of the atom with positive dense nucleus and surrounded by negative electrons (but not neutrons and electron shells)

Question 2

nucleus (of an atom)

Answer 2

the very small and dense central part of an atom that contains protons and neutrons

Question 3

atomic number

Answer 3

the number of protons (which equals the number of electrons) in an atom. It is sometimes called the proton number

Question 4

isotope

Answer 4

atoms that have the same number of protons but different number of neutrons, i.e., they have the same atomic number but different mass numbers

Question 5

mass number

Answer 5

the number of protons plus neutrons in the nucleus of an atom

Question 6

standard form

Answer 6

a system of writing numbers which can be particularly useful for working with very large or very small numbers

Question 7

electron shell

Answer 7

an area in an atom, around its nucleus, where electrons are found

Question 8

electronic arrangement

Answer 8

a set of numbers to show the arrangement of electrons in their shells (or energy levels)

Question 9

group number

Answer 9

all the elements in the columns (labelled 1 to 7 and 0) in the periodic table

Question 10

atom

Answer 10

the smallest part of an element that can still be recognised as that element

Question 11

electron

Answer 11

a tiny particle with a negative charge. Electrons orbit the nucleus of atoms or ions in shells

Question 12

proton

Answer 12

a tiny positive particle found inside the nucleus of an atom

Question 13

neutron

Answer 13

a dense particle found in the nucleus of an atom. It is electrically neutral, carrying no charge

Question 14

element

Answer 14

a substance made up of only one type of atom. An element cannot be broken down chemically into any simpler substance

Question 15

mixture

Answer 15

A combination of two or more substances that are not chemically combined

Question 16

compound

Answer 16

a substance made when two or more elements are chemically bonded together

Question 17

ion

Answer 17

a charged particle produced by the loss or gain of electrons

Question 18

plum pudding model

Answer 18

J.J Thomsons model of an atom, in which he thought electrons were randomly distributed within a positively charged cloud