Some instances:
Days of the week,
Wonders of the ancient world,
Wonders of the modern world,
Pleiades (Seven sisters),
Ages of Man (Shakespeare, As You Like It),
Deadly sins (Christianity),
Notes in the Musical scale,
Colours of Rainbow (except that Newton, who originally studied the optical spectrum used only four colours - it is a continuum after all - but harmonising with musical frequencies (see above) led to seven colours.
Seven swans a swimming
7 groups, with 3 in each3 groups, with 7 in each21 groups, with 1 in each1 group, with 21 in each
The Keystone State.
scorpion legs
what come in groups of four
gaggle of geese
7 days in a week.
days in a week
Seven swans a swimming
a long taeble with 7 legs
There are 7.
7 groups of 4000= 7 x 4000 7 x 4000 = 28 000
7 groups, with 3 in each3 groups, with 7 in each21 groups, with 1 in each1 group, with 21 in each
There are 18 groups and 7 periods in the periodic table. Groups indicate the number of valence electrons an element has, while periods indicate the number of electron shells an element has.
56 will split into the following groups... 56 groups of 1 28 groups of 2 14 groups of 4 7 groups of 8 8 groups of 7 4 groups of 14 2 groups of 28 and 1 group of 56
42
Ethnic groups of what/where - specify so we can give you an answer.