Question

ЛЮДИ ХЕЛП МИ ЭТО ХИМИЯЯЯ среди приведённых химических элементов определи те, которые находятся в третьем периоде периодической системы: Ru, Ag, Br, Mg, Mn, Si, N, Sв ответе укажи сумму их порядковых номеров​

Answer 1

Mg, S, Si

Mg = 12, S = 16, Si = 14 => 12 + 14 + 16 = 42

Answer 2

Identifying Elements in the Third Period of the Periodic Table

To determine the chemical elements that are located in the third period of the periodic table, we need to consider the elements Ru, Ag, Br, Mg, Mn, Si, N, and S. Let's calculate the sum of their atomic numbers.

The elements in the third period of the periodic table are: - Ru (Ruthenium) - Ag (Silver) - Br (Bromine) - Mg (Magnesium) - Mn (Manganese) - Si (Silicon) - N (Nitrogen) - S (Sulfur)

Sum of Atomic Numbers

To find the sum of their atomic numbers, we can use the following atomic numbers: - Ru (Ruthenium) - Atomic number: 44 - Ag (Silver) - Atomic number: 47 - Br (Bromine) - Atomic number: 35 - Mg (Magnesium) - Atomic number: 12 - Mn (Manganese) - Atomic number: 25 - Si (Silicon) - Atomic number: 14 - N (Nitrogen) - Atomic number: 7 - S (Sulfur) - Atomic number: 16

Sum of their atomic numbers: 44 + 47 + 35 + 12 + 25 + 14 + 7 + 16 = 200

Therefore, the sum of the atomic numbers of the elements in the third period of the periodic table is 200.