Which element is not isoelectronic with the noble gas argon. K^+ Al^3+ S^2- Ca^2

Question

Which element is not isoelectronic with the noble gas argon. K^+ Al^3+ S^2- Ca^2+ Which of the following number is the largest: 8.673 Times 10^-7 9.5000 Times 10^0 5.9267 Times 10^-1 0.0039 The measurement 0.000000629 in scientific notation given to 2 significant figure becomes: 6.2 Times 10^-8 6.0 Times 10^-7 6.30 Times 10^-8 6.3 Times 10^-7 In which of the following pairs of elements are both members of the pair metals N & Se S & Cd Li & Fe Sn & I I and II II and IV only II only III If you were given the following measurements, which of the following zeros significant: 1.02 m 500 L 50.0 mL 1.00 Times 10^2 kg Which of the following pairs of atoms have the same properties with one O & N Se & As Be & Ca F & Ar

Explanation / Answer

1.

Option (b) Al3+ is not isoelectronic with noble gas Argon because it has different number of electrons.

2.

Option (b) 9.5000 x 100

3.

Option (d) 6.3 x 107

4.

Option (d) only III Li and Fe (option e is not visible.)

5.

Option (b) 500L (The trailing zeros in a whole number are not significant. They are used to keep the other figures in there correct places.)

6.

Option (c) Be and Ca have same properties with one another because they belong to same group 2A.

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