Elements 87-118: period 7, with the actinides

32 items · Ages 13+ · In order

32 elements, all in period 7. Th to Lr sit in the f-block, which has no group number. Most tables put lanthanum (57) and actinium (89) in group 3, as ours does; some put lutetium (71) and lawrencium (103) there instead. IUPAC has not settled the question. Elements beyond about 100 have been made only a few atoms at a time.

Row seven finishes the table: radium and uranium, the actinides, and the heavy elements made in laboratories, the last of them named in 2016. Every element in this list is in period 7.

How to learn it

Many of these names honor places and people (americium, californium, einsteinium, curium, nobelium), so build a picture for each: a map pin, a portrait, a city skyline. The actinides run in the same order as the lanthanides above them, so learn them side by side. Chunks of five, reviewed on the 1-3-7-21 schedule, keep the long tail from slipping.

Encode make it vivid → Space bring it back on day 1, 3, 7, 21 → Retrieve pull it from your head. From the infographic Remember It on Purpose.

Elements 87-118: period 7, with the actinides

Atomic number	Symbol	Element	Group
87	Fr	Francium	1
88	Ra	Radium	2
89	Ac	Actinium	3
90	Th	Thorium	f-block
91	Pa	Protactinium	f-block
92	U	Uranium	f-block
93	Np	Neptunium	f-block
94	Pu	Plutonium	f-block
95	Am	Americium	f-block
96	Cm	Curium	f-block
97	Bk	Berkelium	f-block
98	Cf	Californium	f-block
99	Es	Einsteinium	f-block
100	Fm	Fermium	f-block
101	Md	Mendelevium	f-block
102	No	Nobelium	f-block
103	Lr	Lawrencium	f-block
104	Rf	Rutherfordium	4
105	Db	Dubnium	5
106	Sg	Seaborgium	6
107	Bh	Bohrium	7
108	Hs	Hassium	8
109	Mt	Meitnerium	9
110	Ds	Darmstadtium	10
111	Rg	Roentgenium	11
112	Cn	Copernicium	12
113	Nh	Nihonium	13
114	Fl	Flerovium	14
115	Mc	Moscovium	15
116	Lv	Livermorium	16
117	Ts	Tennessine	17
118	Og	Oganesson	18

Elements 87-118: period 7, with the actinides: practice sheet

Name: ______________________ Date: ____________ Score: ____ / 32

Atomic number	Symbol	Element	Group
		Francium
		Radium
		Actinium
		Thorium
		Protactinium
		Uranium
		Neptunium
		Plutonium
		Americium
		Curium
		Berkelium
		Californium
		Einsteinium
		Fermium
		Mendelevium
		Nobelium
		Lawrencium
		Rutherfordium
		Dubnium
		Seaborgium
		Bohrium
		Hassium
		Meitnerium
		Darmstadtium
		Roentgenium
		Copernicium
		Nihonium
		Flerovium
		Moscovium
		Livermorium
		Tennessine
		Oganesson

Write from memory, then check against the study sheet. Mark the misses and review those first next time. · teddyrookbook.com/memory/challenges/elements-87-118/

Sources

Checked October 30, 2026. Progress is kept on this device only (per learner). More lists: all memory challenges · memory games.