Which group of elements is characterized as having little to no reactivity? Halogens

Chemistry

2 answers:

m_a_m_a [10]3 years ago

8 0

Which group of elements is characterized as having little to no reactivity?

C. Alkali Metals

finlep [7]3 years ago

4 0

Answer: Noble gases

Explanation: Noble gases constitutes the extreme right position in the periodic table,

They are have the smallest atomic radius and are the most unreactive elements present in the whole periodic table. There outermost shell of electrons that is valence shell of electrons is completely full thus there is no chance of loss or gain of electrons.

Thus noble gas elements are also known as Inert Gases.

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3 years ago

How many total atoms are in 0.920 g of P2O5?

lions [1.4K]

Molar mass P2O5 = 31 x 2 + 16 x 5 => 142 g/mol

142 g ---------------- 6.02 x 10²³ molecules
0.920g g ------------ ( molecules )

molecules = 0.920 x ( 6.02 x 10²³ ) / 142

molecules = 5.53 x 10²³ / 142

= 3.89 x 10²¹ molecules

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3.89 x 10²¹ molecules -------------------- ( atoms )

atoms = ( 3.89 x 10²¹) x 7 / 1

atoms = 2.72 x 10²² atoms of P2O5

hope this helps!

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Read 2 more answers

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