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What is atomic radius?
Distance from the nucleus to the outermost shell.
What is its unit?
Picometers
What happens to valence electrons across a period?
The valence electrons increase by 1 across the period
What is effective nuclear charge?
The positive charge from the nucleus which acts on the valence electrons
What is the trend of atomic size across a period?
The atomic size decreases as we go from left to right across a period.
What happens to the no. of shells down a group?
The number of shells increases by 1 as we go down the group.
What happens to atomic size down a group?
Atomic size increases from top to bottom in a group
What element has the smallest atomic size?
Helium
Argon and neon are elements of the same period but of different groups. which one would have a lower atomic radius.
Argon
3 elements A, B, and C have the period number and group number A(7,3) B(7,16) C(7,2) respectively. Which 2 elements have the largest and smallest atomic size.
Largest size-C Smallest- B
Sodium and Magnesium are elements of the same period but of different groups. which one would have a lower atomic radius?
Magnesium would have a lower atomic radius since atomic radius decreases from moving across the period
Arrange O, F, and N in order of decreasing atomic radius.
N, O, F
Which element has the largest atomic radius?
Cesium
3 elements have atomic numbers of A-25, B-29, and 3C-5 respectively. Which 2 elements have the largest and smallest atomic size?
Largest-B Smallest-A
A metal n is in the first group of the periodic table what will be the formula of its oxide?
n2o