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krek1111 [17]
3 years ago
7

Mendeleev devised his periodic table by ordering the elements according to their atomic number.

Chemistry
1 answer:
marusya05 [52]3 years ago
7 0

Answer:

False

Explanation:

The given statement is false.

Mendeleev devised periodic table by arranging elements in increasing order of their atomic masses.

According Mendeleev, physical and chemical properties of the elements are function of their atomic masses.

Henry Moseley arranged elements in increasing order of atomic number. Periodic table based on increasing order of atomic number is called modern periodic table.

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alex41 [277]
The answer would be: <span>D. Kb for HS–
</span>
Kb is the dissociation constant of an acid/base molecule. The word b in Kb is base, which means the formula should have an OH- ion inside it. Ka would be the opposite of Kb where the formula has H+ ion.
In this question, the formula is: [H2S][OH-]/ [HS-]
Since there are OH- ion. Since H2S is acid and HS- is base, I think it should be <span>Kb for HS–
</span>
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The correct options are these:

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