Question

5. Which statement describes the elements in Period 3?
A) Each successive element has a greater atomic
radius.
B) Each successive element has a lower
electronegativity
C) All elements have similar chemical properties.
D) All elements have valence electrons in the same
valence shell.

Answer 1

All elements in period 3 have valence electrons in the same valence shell.

• Elements are arranged in the periodic table in rows and periods. In a row, elements exhibit same properties but in a period, the properties change as you move across the period.

• The elements in Period 3 have the same valence shell but with valence electrons of different number.

• Now, In  period 3, starting with Na,Sodium, we will see that it has 3 shells, with one valence electron in its valence shell, the next element  is Magnesium also having 3 shells but with in 2 electrons its valence shell.

• The number of valence electrons increases in the valence shell in Period 3  till we get to Argon where we experience an octet configuration.

• Therefore we can conclude that elements in Period 3 have valence electrons in the same valence shell.

See more on trends in period 3 elements: https://brainly.com/question/539322