Elements in . i) Down the group, the atomic size and metallic character of elements increase. Chemestry. The modern periodic table of the elements contains 18 groups, or vertical columns. The periodic table consists of seven periods. All of the elements in a period have the same number of atomic orbitals. 18 elements (K, Ca, Sc, etc.) How many elements does Period 1 have? How many periods are there in the periodic table ... A.Li B.Si C.Br D.Ne Br, along with F, a halogen (column 7 of the periodic table) Look at the periodic table. The modern periodic table consists of 18 groups and 7 periods. There are seven periods currently. Periods 2&3 have 8 each (Lithium to Argon). A period is a horizontal row of elements on the periodic table. If you can locate an element on the Periodic Table, you can use the element's position to figure out the energy level of the element's valence electrons. The periods vary in length. For example, the elements sodium (\(\ce{Na}\)) and magnesium (\(\ce{Mg}\)) are both in period 3. For example, every element in the top row (the first period) has one orbital for its electrons. A new period begins when a new principal energy level begins filling with electrons. There are seven periods in the periodic table, with each one beginning at the far left. Period 1 has just two elements (Hydrogen & Helium). Periods 4&5 have 18 elements each (Potassium to Xenon). There are seven rows, or periods, in the Periodic Table of Elements. In the periodic table, there are 2 electrons in period 1, while both periods 2 and 3 have 8 electrons in the filled level. 7 periods and 18 groups. ‍ The groups are the vertical columns. When you look at the periodic table, each row is called a period (Get it? Periods of the Periodic Table. ii) On moving from left to right in a period, the atomic size and metallic character of elements decreases. For atoms with atomic numbers less than about 20, the octet rule of electron addition and orbital filling applies. asked Jun 7, 2018 in Class X Science by priya12 ( -12,630 points) Elements in a group have similar chemical and physical properties because they have the same number of outer electrons. The columns are called groups. 8 elements (Li, Be, B, C, N, O, F, and Ne) How many elements does Period 4 have? The periodic table today is arranged with two different parts, the groups and the periods. Like PERIODic table.). 2 elements (H and He) How many elements does Period 2 have? The first periodic table. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements. 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