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3 years ago

Is magnesium a metal or a nonmetal? How many valence electrons does a magnesium atom have?

Chemistry

2 answers:

MatroZZZ [7]3 years ago

6 0

Magnesium is classified as a metal. Magnesium has two valence electrons

Romashka-Z-Leto [24]3 years ago

3 0

Answer: The given element is a metal and the number of valence electrons are 2

Explanation:

There are 2 types of elements in the periodic table:

Metals are the elements which have a tendency to loose electrons and thus they form cations. For Example: Sodium will loose 1 electron to form $Na^+$ ion.
Non-metals are the elements which have a tendency to gain electrons and thus they form anions. For Example: Chlorine will gain 1 electron to form $Cl^-$ ion.

Valence electrons are defined as the electrons which are present in the outermost shell of an atom. Outermost shell has the highest value of 'n' that is principal quantum number.

We are given:

Magnesium is the 12th element of the periodic table having electronic configuration of $1s^22s^22p^63s^2$

This element will loose 2 electrons to form $Mg^{2+}$ ion

Number of valence electron in magnesium element = 2

Hence, the given element is a metal and the number of valence electrons are 2

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Using the thermodynamic information in the ALEKS Data tab, calculate the standard reaction free energy of the following chemical

julia-pushkina [17]

Answer:

43.0 kJ

Explanation:

The free energy (ΔG) measures the total energy that is presented in a thermodynamic system that is available to produce useful work, especially at thermal machines. In a reaction, the value of the variation of it indicates if the process is spontaneous or nonspontaneous because the free energy intends to decrease, so, if ΔG < 0, the reaction is spontaneous.

The standard value is measured at 25°C, 298 K, and the value of free energy varies with the temperature. It can be calculated by the standard-free energy of formation (G°f), and will be:

ΔG = ∑n*G°f products - ∑n*G°f reactants, where n is the coefficient of the substance in the balanced reaction.

By the balanced reaction given:

2NOCl(g) --> 2NO(g) + Cl2(g)

At ALEKS Data tab:

G°f, NOCl(g) = 66.1 kJ/mol

G°f, NO(g) = 87.6 kJ/mol

G°f, Cl2(g) = 0 kJ/mol

ΔG = 2*87.6 - 2*66.1

ΔG = 43.0 kJ

6 0

3 years ago

Which of the following particles combine to form molecules?

solniwko [45]

Answer: i think its protons and electrons but it also might just be atoms because protons and electrons make atoms when there are also neutrons

Explanation:

7 0

3 years ago

a couple of pennies have a mas of 5.2 grams. Asuming that the pennies are 100% percent copper,how many moles of copper are the p

dangina [55]

Answer:

5.2g copper (Cu) => 0.082 moles copper (2 sig.figs.)

Explanation:

mole conversions:

grams to moles => divide by formula wt.

moles to grams => multiply by formula wt.

gas volumes to moles => divide volume by 22.4Liters/mole (STP conditions only)

This problem:

mass to moles => divide by formula wt.

mass = 5.2g = 5.2g/63.5g/mole = 0.082 moles copper (2 sig.figs.)

5 0

2 years ago

Is cotton yarn a natural resource?

Natalija [7]

Yes, because cotton is a plant and then the cotton is then made into a ball of yarn.

8 0

3 years ago

Why can’t an atom lose or gain a proton

Veronika [31]

Explanation:

Atoms never gain protons; they become positively charge only by losing electrons. A positive ion is called a cation (pronounced: CAT-eye-on). You may have notice that the number of neutrons in each of these ions was not specified.

6 0

3 years ago

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