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xenn [34]
1 year ago
15

In complete sentences, provide a short explanation (2-3 sentences) as to why the elements are organized as they are within the p

eriodic table.
help please
Chemistry
1 answer:
solong [7]1 year ago
7 0

Answer:

The periodic table is arranged by atomic weight and valence electrons. These variables allowed Mendeleev to place each element in a certain row (called a period) and column (called a group). The table comprises seven rows and 18 columns

Explanation:

please consider as brainlest if helpful

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Erbium (Er) is element 68 on the periodic table. A sample contains 5.04×1023 atoms of Er. Calculate the amount of Er.
Korvikt [17]

Answer:

139.98 g to nearest hundredth.

Explanation:

Using Avogadro's Number:

One mole (167.26 g) of Erbium  equates to  6.022141 * 10^23 atoms.

So 5.04 * 10^23 = 167.26 * 5.04/6.022141

= 139,98 g.

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8 0
3 years ago
Why was Niels Bohr’s atomic model superior to all the earlier models?
Elena L [17]

Answer the correct option will be option B.

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option A is one of postulates given by Dalton in his Dalton's atomic theory which later proved to be wrong.

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option D Schrodinger has used the wave nature to explain the position of electrons around the nucleus.


5 0
3 years ago
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