how many groups and periods does the modern periodic table have

6 periods and 14 groups
7 periods and 18 groups
8 periods and 19 groups
9 periods and 20 groups
The modern periodic table of the elements contains 18 groups, or vertical columns. Elements in a group have similar chemical and physical properties because they have the same number of outer electrons. The periodic table consists of seven periods. The periods vary in length.
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Answers by country

6 periods and 14 groups
7 periods and 18 groups
8 periods and 19 groups
9 periods and 20 groups
answers
flagMalaysia
9%
81%
9%
0%
11
flagIndia
3%
60%
29%
5%
235
flagPakistan
3%
59%
21%
12%
32
flagGhana
5%
72%
22%
0%
18
flagAustralia
12%
56%
20%
10%
48
flagPoland
12%
45%
31%
9%
1781
flagthe United Arab Emirates
18%
54%
18%
0%
11
flagNigeria
16%
52%
16%
10%
68
flagthe United States
13%
46%
27%
9%
106
flagCanada
21%
47%
13%
13%
23
flagthe Philippines
9%
45%
9%
27%
11
flagthe United Kingdom
18%
40%
28%
9%
88
flagGreece
11%
29%
47%
11%
17
flagGermany
22%
28%
34%
11%
35