8.
lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon.
Period 1: 2 elements Period 2: 8 elements Period 3: 8 elements Period 4: 18 elements Period 5: 18 elements Period 6: 32 elements Period 7: 25 elements
There are 2 elements in the first period, 8, 8 elements in 2nd and 3rd periods respectively,
No, period 1 elements are not more electronegative than period 2 elements. Electronegativity generally increases across a period from left to right, so elements in period 2 are generally more electronegative than elements in period 1.
2. hydrogen and something else
8 elements
all elements in a period all have the same amount of shells example: all elements in period 1 has only 1 shell all elements in period 2 has 2 shells so the period number is the same as the number of shells in that period
103
The trend in period 2 ionization energy across the elements increases from left to right.
There are 18 elements in period 4.
there are 32 elements in period 6.
Group 4 elements on the periodic table contain no period 2 elements whatsoever.
18