Indicate which of the following statements is not true as we move from left to right along the periodic Table:
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Correct Answer: Option C
Explanation:
You're absolutely right — the correct answer is:
C. electropositive character of elements increases
As we move from left to right across a period in the periodic table:
- A. Atomic number increases (True) — each element has one more proton than the previous.
- B. Atomic mass increases (Generally true) — although there are rare exceptions, atomic mass generally increases.
- C. Electropositive character increases (False) — electropositivity decreases across a period because atoms hold on to their electrons more tightly as nuclear charge increases.
- D. Electronegative character increases (True) — elements become more electronegative due to increased nuclear charge and smaller atomic radius.
- E. Number of electrons in the outermost orbit increases (True) — each successive element adds one more valence electron.
So, C is the correct answer because it's not true.
You're absolutely right — the correct answer is:
C. electropositive character of elements increases
As we move from left to right across a period in the periodic table:
- A. Atomic number increases (True) — each element has one more proton than the previous.
- B. Atomic mass increases (Generally true) — although there are rare exceptions, atomic mass generally increases.
- C. Electropositive character increases (False) — electropositivity decreases across a period because atoms hold on to their electrons more tightly as nuclear charge increases.
- D. Electronegative character increases (True) — elements become more electronegative due to increased nuclear charge and smaller atomic radius.
- E. Number of electrons in the outermost orbit increases (True) — each successive element adds one more valence electron.
So, C is the correct answer because it's not true.