Question

В периоде с ростом порядкового номера элементов усиливаются неметаллические свойства и ослабевают металлические,потому что:1)увеличивается число___________2)постоянно число_______________3) увеличивается________________

Answer 1

1атомов на внешнем уровне
2электронных облаков
3радиус атома

Answer 2

Explanation of Changes in Properties of Elements with Increasing Atomic Number

When the atomic number of elements increases, the non-metallic properties are strengthened, and the metallic properties are weakened. This is due to several factors:

1) Number of Protons Increases: - As the atomic number increases, the number of protons in the nucleus also increases. This leads to a stronger positive charge in the nucleus, exerting a greater pull on the negatively charged electrons, thus affecting the chemical properties of the elements.

2) Constant Number of Electron Shells: - While the number of protons increases, the number of electron shells remains constant. This results in a stronger attraction between the positively charged nucleus and the negatively charged electrons, leading to changes in the reactivity and properties of the elements.

3) Increase in Electronegativity: - With the increase in atomic number, there is an increase in electronegativity, which is the tendency of an atom to attract a shared pair of electrons towards itself. This affects the ability of the elements to form bonds and participate in chemical reactions, contributing to the changes in their properties.

In summary, the increase in the atomic number of elements affects their properties by altering the balance of protons and electrons, leading to changes in reactivity, electronegativity, and overall chemical behavior.