A period is represented by a horizontal line as we move from left to right in a periodic table.
Since, number of electrons keep on adding into the elements while we move in a period. Therefore, number of valence electrons also increases in a period and when the valence shell of last element of a period gets completely filled then the cycle repeats itself.
And elements with same number of valence electrons will show same chemical properties.
Thus, we can conclude that the chemical properties cycle through each period because each period represents a cycle of completing the outer electron shell.
The correct answer would be the third option. The chemical properties cycle through each period because the atoms' outermost shells having two or more electron shells cannot have more than eight electrons. This is following the octet rule.
Answer: Solving by the method of exponential growth. bacteria = 2 after one hr = 2² = 4 after 2nd hr = 2³ = 8 after 3rd hr = 2⁴ = 16 after 4th hr = 2⁵ = 32
This is your answer because the white one would have a harder time to blend in with the tree's and the environment, whilst the grey one is better suited for its environment better due to the fact that it can blend in with the trees, and hide better.
