What happens to the attractive force as you move across a period?
Moving Across a Period
Moving from left to right across a period, the atomic radius decreases. The nucleus of the atom gains protons moving from left to right, increasing the positive charge of the nucleus and increasing the attractive force of the nucleus upon the electrons.
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.
What increases as you move across a period?
As we move left to right across a period we are also observing an increase in atomic charge (the number of protons is increasing). This greater nuclear attraction pulls the electrons in more closely, and the atomic radii actually decrease.
Why does nuclear attraction increase across a period?
Across a period, effective nuclear charge increases as electron shielding remains constant. This pulls the electron cloud closer to the nucleus, strengthening the nuclear attraction to the outer-most electron, and is more difficult to remove (requires more energy).
Is attraction is also a pull?
Attraction or repulsion between two objects can also be seen us another form of. (A) pull or push. … Hint:Attractive force is the force that makes the object to come close to each other whereas the repulsive force acts on the object and makes them move away from each other.
What is vanderwall force of attraction?
van der Waals forces, relatively weak electric forces that attract neutral molecules to one another in gases, in liquefied and solidified gases, and in almost all organic liquids and solids. … The tendency of such permanent dipoles to align with each other results in a net attractive force.
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. … Electrostatic force and distance are inversely related.
What is a Zeff?
eff. Effective nuclear charge, Zeff: the net positive charge attracting an electron in an atom. An approximation to this net charge is. Zeff(effective nuclear charge) = Z(actual nuclear charge) – Zcore(core electrons) The core electrons are in subshell between the electron in question and the nucleus.