What happens to the properties of elements as you move from left to right across a period in the periodic table?

As you move from left to right across a period in the periodic table, the elements transition from metals to non-metals. This shift is characterized by a decrease in metallic character and an increase in non-metallic character.

Metals, which are found on the left side of a period, tend to lose electrons easily and exhibit properties such as conductivity and malleability. As you move towards the right, the elements progressively exhibit characteristics typical of non-metals, such as gaining electrons and forming negative ions. Non-metals have higher electronegativities and typically show varying levels of reactivity.

This trend illustrates the gradual change from elements that are good conductors of electricity and heat to those that are poor conductors and often form covalent bonds. Therefore, as one moves across a period, the properties of elements become less metallic and more non-metallic, confirming that the correct choice reflects this progression accurately.