A Short Essay on Ionization Energy

A Short Essay on Ionization Energy

Document details
Category: Science Essay
Subcategory: Physics
Words: 250
Pages: 1

Ionisation energy is the energy to remove the first electron from an atom in the gaseous state. - Increases across a period as electron shells go from near empty to full. - Decreases down a group as the outer electrons become further removed from the positive nucleus. - The second ionisation energy is always greater than the first since the electron is now being removed from a positive ion. Electronegativity is the relative power to attract electrons. - Increases across a period as the number of protons increases so does the positive charge of the nucleus, thus a stronger attraction and electrons are being held more tightly. - Decrease down a group as the negatively charged electrons repel each other and the 'invaders'. The more protons, the greater the number of occupied electron shells that shield the nucleus. - Fluorine is the most electronegative element and when combined with caesium, will react violently. Atomic Radius - Decreases across a period because the number of positively charged protons in the nucleus increases, pulling the negative electrons in more tightly. - Increases down a group as the number of electron shells increase. Melting and Boiling Points - Increases to Group IV, then rapidly decreases. - Groups I and II (Metallic bond). Moderate to high - Group IV (Covalent network solids). Very high - Group VII (Diatomic covalent). Forces between molecules are weak so it's low. - Group VIII (Monatomic gases). Only forces between atoms are weak dispersion forces so its very low...

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