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20 questions
Electronegativity is...
the ability of an atom to attract bonding electrons
the ability of an atom to lose electrons
the energy required to remove an electron from a specific atom
how easy it is to make friends.
How the elements are arrange in the periodic table?
according to alphabetical order
according to increasing atomic size
according to increasing molar mass
according to increasing proton number
Why sodium (Na) and Lithium (Li) come from the same group?
Both have the same value of principle quantum number (n)
Both have the same number of valence electrons
Both are metal elements
Both are basic oxide
Identify GROUP, PERIOD and BLOCK for an element with electronic configuration:
1s22s22p63s23p6
GROUP :6
PERIOD : 3
BLOCK : p
GROUP :8
PERIOD : 3
BLOCK : p
GROUP :16
PERIOD : 3
BLOCK : p
GROUP :18
PERIOD : 3
BLOCK : p
Which element has an oxidation number -2
1s22s22p2
1s22s22p4
1s22s2
1s22s22p63s2
Why 6C and 8O located in the same period?
both have the same number of valence electron
both have the same highest principle quantum number
both come from the same block
both are non-metal element
Given:
W : 1s22s22p63s2
State the formula for oxide W.
WO
W2O
WO2
W2O2
ELEMENT : K
GROUP :4
PERIOD : 4
Propose an electronic configuration for elemet K.
1s22s22p63s23p63d104s24p4
1s22s22p63s23p63d44s2
1s22s22p63s23p63d24s2
1s22s22p63s23p63d104s24p2
Alkaline metal are the elements from:
Group 1
Period 1
Group 2
Group 1 and Group 2
Which of the following causes ionisation energy to increase when going across period 3 from left to right?
I.Increase in shielding effect
II . Decrease in atomic radius
III. Increase in nuclear charge
II and III only
I only
I and II only
I,II and III
Choose the correct order in increasing ionic radii from the set below
Al3+; Mg2+, Na+ ; O2-
O2-; Na+; Mg2+, Al3+
Na+; Mg2+; Al3+; O2-
O2-; Al3+, Mg2+; Na+
Na2O is classify as
acidic oxide
amphoteric oxide
basic oxide
neutral oxide
The first seven ionisation energies of element M are 786, 1577, 3229, 4356, 16080, 19790 and 23780 kJmol-1. In the Periodic Table, element M is in group
3
4
12
14
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