Does the force of attraction increase or decrease across a period?
Across a period, the distance between the nucleus and the valence electrons remains constant but the effective core charge increases. As a result the force of attraction between the nucleus and the valence electrons increases across a period.
Why does electron attraction increase across a period?
Across a period, effective nuclear charge increases as electron shielding remains constant. A higher effective nuclear charge causes greater attractions to the electrons, pulling the electron cloud closer to the nucleus which results in a smaller atomic radius. … This results in a larger atomic radius.
When does the force of attraction increase?
The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them. This means that the force of gravity increases with mass, but decreases with increasing distance between objects.
How do you increase electrostatic attraction?
Increasing the separation distance between objects decreases the force of attraction or repulsion between the objects. And decreasing the separation distance between objects increases the force of attraction or repulsion between the objects.
Why does the force of attraction between the nucleus and electrons decrease down a group?
The electrostatic attraction between nucleus and valence electrons is weaker and results in less energy needed to remove an electron from the outermost shell. Therefore a decrease in IE down a group.
Why does metal reactivity decrease across a period?
Period – reactivity decreases as you go from left to right across a period. The farther to the left and down the periodic chart you go, the easier it is for electrons to be given or taken away, resulting in higher reactivity. … Group – reactivity decreases as you go down the group.
Which of the following properties increases across a period?
Ionization energy and electron affinity increase across a period, and decrease down a group.
What happens to metallic character across a period?
> When we move across a period from right to left in the periodic table, the metallic character of elements decreases. This happens because atoms of elements across a period from right to left accept electrons more readily to fill their valence shell.