Which element in period 2 has the most mass

Chemistry

2 answers:

kodGreya [7K]3 years ago

6 0

The element neon, in period 2, has the most mass.

mixas84 [53]3 years ago

5 0

Answer:

Neon

Explanation:

Elements are arranged in a certain order in a table known as the periodic table of elements, and they are arranged in groups and periods with similar properties to each other. Earlier in history when Dmitri Medeleev created the first periodic table, some spaces were left open because many elements had not been discovered, however using this table, the properties of these elements could be predicted, even though the had not been discovered.

In period 2 of the periodic table, the mass of each element increases from left to right. Hence, it can be seen that out of the elements in period 2, lithium (Li) has the lowest mass, and neon (Ne) has the highest mass.

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Calculate the molarity of a solution of Nach if it contains 7.2.g Nach in 100.0 mL of solution. andver: m Nach . .

Norma-Jean [14]

Answer:

1.23 M

Explanation:

Molarity of a substance , is the number of moles present in a liter of solution .

M = n / V

M = molarity

V = volume of solution in liter ,

n = moles of solute ,

Moles is denoted by given mass divided by the molecular mass ,

Hence ,

n = w / m

n = moles ,

w = given mass ,

m = molecular mass .

From the question ,

w = given mass of NaCl = 7.2 g

As we know , the molecular mass of NaCl = 58.5 g/mol

Moles is calculated as -

n = w / m = 7.2 g / 58.5 g/mol = 0.123 mol

Molarity is calculated as -

V = 100ml = 0.1 L (since , 1 ml = 1/1000L )

M = n / V = 0.123 mol / 0.1 L = 1.23 M

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2 years ago

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Talja [164]

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2 years ago

In the following reaction, how many grams of silver can be produced from 49.1 g copper?

notsponge [240]

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