Question

сколько всего элементов находится в каждом периоде? первом, втором, 3 4 5 6 и 7?

Answer 1

1 период - 2 элемента

2 п. - 8 эл.

3 п. - 8 эл.

4 п. - 18 эл

5 п - 18 эл

6 п - 32 эл

7 п. от франция-не закончен + актиноиды (14)

Answer 2

Number of Elements in Each Period

To determine the number of elements in each period, we can refer to the periodic table. The periodic table is organized into periods, which are horizontal rows. Each period represents the energy level or shell in which the electrons of the elements are located.

Here is the number of elements in each period:

- First Period: The first period contains only two elements, hydrogen (H) and helium (He).- Second Period: The second period contains eight elements, starting from lithium (Li) and ending with neon (Ne).- Third Period: The third period also contains eight elements, starting from sodium (Na) and ending with argon (Ar).- Fourth Period: The fourth period contains 18 elements, starting from potassium (K) and ending with krypton (Kr).- Fifth Period: The fifth period contains 18 elements, starting from rubidium (Rb) and ending with xenon (Xe).- Sixth Period: The sixth period contains 32 elements, starting from cesium (Cs) and ending with radon (Rn).- Seventh Period: The seventh period is still incomplete, and the number of elements in this period is not yet known.

Please note that the number of elements in each period may vary depending on the specific periodic table being referenced. The information provided here is based on the most commonly used periodic table.

I hope this helps! Let me know if you have any further questions.