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Which of the following IS NOT a periodic trend: bond enthalpy, atomic radius or effective nuclear charge?
bond enthalpy
Atomic radius increase from ______ to _______ in the same group.
top to bottom
Is the sodium cation (Na+) radius bigger or smaller than the sodium neutral atom radius?
smaller
Is the chlorine anion (Cl-) radius bigger or smaller than the chlorine neutral atom radius?
bigger
Mg2+ and O2- are isoelectronic. What does it mean?
That they have the same number os electrons
The elements are arranged in order of increasing __________.
nuclear charge or number or protons
What is the effective nuclear charge of sodium (Z = 11)?
+1
What is the first ionisation energy?
The first ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms to form one mole of gaseous 1+ ions.
What is electronegativity?
Electronegativity is defined as the attraction of an atom for a bonding pair of electrons.
What are the 3 most electronegative elements?
F, O, N
Which of the two, metals or non-metals, tend to gain electrons to form negative ions (anions) instead of losing electrons to form positive ions?
Non-metals
Is MgO a basic or acidic oxide?
basic
How do you prove an oxide is a basic oxide?
Basic oxides dissolve in water to produce basic solutions.
Which is the the most reactive group of metals?
The alkali metals
Which is the most reactive group of non-metals?
The Halogens
