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more valence shell, size of atom increases thus further away from the nucleus as nucleus has the attractive force.

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since the valence electrons is further away from the nucleus, the size of the atom increases, the strength of the attractive forces of the nucleus decreases,hence it is easier to lose valence electrons

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As the valence shell gets further away from the nucleus the electrostatic force of attraction between the valence electron and proton is weaker. Thus, it is easier to lose the valence electron during bonding as the atom gets bigger.

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The proton and electron has opposite charges that hold each other in place. Therefore, as the element goes down the group, the valance shell gets furthur away from the nucleus. Thus it is easier for that element to lose its valance electron during bonding as the electrostatic force decreases when it is further away.

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The size of atom increases as it goes down a group. Valence electrons of an electron will be further away from the electrostatic force of the nucleus. Therefore, an element further down a group will lose its valence electrons more easily.

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Element K has four valence shell, while element Na and element Li has three and two valence shell respectively. The valence electron of element K is furthest away from the attractive forces of nucleus. Therefore, the wekear the electrostatic forces of attraction between the proton and electron, the easier it is to lose the valence electrons.

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When going down a group ,the size of the atom increases. Thus the valence electron of the element will be further away of electrostatic force of the nucleus .making the valence electron more vulnerable to be lost.

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More valence electron shells makes the element to lose its valence electron easer as the size increases

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The outer electron of a potassium atom(K) is further from it's nucleus than the outer electron of lithium and sodium atom so the electrostatic forces between the atoms in K is weaker as it gets further away from the nucleus

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-more electron shells, atom becomes bigger.
-valence shell further away
-difficult for electrostatic forces of attraction forces to hold onto electron

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As the valence electron gets further away from the nucleus, the electrostatic forces of attraction acting on the valence electron decreases. Thus, it is easier for K to lose its valence electron during bonding as compared to Na and Li which has valence electrons closer to the nucleus

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- There are more electron shells in element k
- The electrons are further away from the nucleus and the electrostatic forces of attraction is weaker.
- Therefore, it is easier for element k to lose electrons compared to Li and Na.