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3 years ago

Which of the following elements are characterized by having full outermost s and p

Chemistry

1 answer:

meriva3 years ago

6 0

Answer:

Group 8A

Explanation:

Group 8A elements are characterized by having full outermost s and p orbitals. These elements are also known as the noble gases or inert gases. They occupy the last group on the periodic table.

They are known to have an outer shell configuration of ns² np⁶
The configuration reveals that atoms of all the elements have completely filled orbitals in their outer shell sublevels.
This accounts for the non-reactivity of elements in this group.
Most of the elements in the group have high ionization energy and very low electron affinity values.

Some of the elements in this group are Neon, Argon, Krypton, Xenon, and Radon.

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Which reaction is more likely to involve a form of combustion (exothermic)? Explain your reasoning.

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Answer:

The general equation for an exothermic reaction is: Reactants → Products + Energy.

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Calculate how many moles of NH3 form when each quantity of reactant completely reacts according to the equation:

sergiy2304 [10]

The balanced chemical reaction is:

3N2H4(l)→4NH3(g)+N2(g)

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2.6mol N2H4 ( 4 mol NH3 / 3 mol N2H4 ) = 3.47 mol NH3

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4 years ago

Use the drop-down menus to complete each statement.

aleksley [76]

Explanation:

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3 years ago

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Which of the following species has the greatest

Licemer1 [7]

Answer: Option (3) is the correct answer.

Explanation:

When there is a negative charge on an atom then we add the charge with the number of electrons. Whereas when there is a positive charge on an atom then we subtract the charge from the number of electrons.

Atomic number of chlorine is 17. So, number of electrons present in $Cl^{-}$ is 17 + 1 = 18 electrons.

Atomic number of cobalt is 27. So, number of electrons present in $Co^{4+}$ is 27 - 4 = 23 electrons.

Atomic number of iron is 26. So, number of electrons present in $Fe^{2+}$ is 26 - 2 = 24 electrons.

Atomic number of vanadium is 23. So, number of electrons present in V is 23 electrons.

Atomic number of scandium is 21. So, number of electrons present in $Sc^{2-}$ is 21 + 2 = 23 electrons.

Thus, we can conclude that out of the given species, $Fe^{2+}$ has the greatest number of electrons.

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3 years ago

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25.0 cm3 of a solution of sodium hydroxide required 18.8 cm3 of 0.0500 mol/dm3 H2SO4

marshall27 [118]

Answer:

i think so

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3 years ago