All categories

3 years ago

Rank the ions in each set in order of increasing size:

Chemistry

1 answer:

tangare [24]3 years ago

7 0

Answer:

a) F⁻ < Cl⁻ < Br⁻

b) Mg²⁺ < Na⁺ < F⁻

c) Cr³⁺ < Cr²⁺

Explanation:

The ions in (a) part of the question belong to a halogen group. F, Cl, and Br are present in periods 2, 3, and 4 respectively. As we move down the group the size of atoms increases hence their ions will be in the same order. (ion from top to bottom of group 7)

The ions in (b) part of the question are isoelectronic. The relative size of such species can be estimated by the charge on their nucleus. Lower the nucleus charge greater will be the size of the ion.

Nuclear charge of Mg²⁺ = no. of protons = 12

Nuclear charge of Na⁺ = no. of protons = 11

Nuclear charge of F⁻ = no. of protons = 9

The ions in (c) part are the two oxidized states of chromium. In such cases, higher the number of nuclear charge smaller will be the ion.

You might be interested in

as the difference in electronegativity between two atoms decreases, the tendency for the formation of covalent bonds

Ghella [55]

Answer:

As the difference in electronegativity between two atoms decreases, the tendency for the formation of covalent bonds "increases"

Explanation:

Electronegativity being a chemical property which tells us about the tendency about the atom in order to fascinate the shared pair of the electron towards itself. It is being pretentious by atomic number and the distance as well, by the help of which the valence electrons resides from the charged nucleus. In the scale Pauling scale is used. Being the most electronegative element fluorine is counted. The more the electronegativity, the more electrons will fascinate towards itself.

4 0

3 years ago

Which of the following is a synthesis reaction? 2Na + 2H 2O 2NaOH + H 2 2S + 3O 2 2SO 3 2H 2O 2 2H 2O + O 2 CaCl 2 + F 2 CaF 2 +

storchak [24]

Answer:

2S + 3O 2 --->2SO 3 synthesis

Explanation:

2Na + 2H 2O -->2NaOH + H 2 single replacement

2S + 3O 2 --->2SO 3 synthesis

2H 2O 2 --->2H 2O + O 2 decomposition

CaCl 2 + F 2 ---> CaF 2 + Cl 2 single replacement

4 0

4 years ago

Why does a gold isotope, with an atomic number of 79, require more neutrons to be stable than a sodium isotope, with an atomic n

Leya [2.2K]

Here’s a simplified explanation.

The protons in the nucleus repel each other. The neutrons provide the “glue” that holds the nucleus together and prevents it from flying apart.

The “glue” is the strong nuclear force. It is strong but extremely short range. It falls off extremely rapidly as the p-n distance increases.

A neon atom has 10 protons. There are three stable isotopes, with 10, 11, and 12 neutrons.

With fewer than 10 protons, the glue is not strong enough to hold the nucleus together.

If there are more than 12 neutrons, the average p-n distance is great enough that the glue has again become too weak.

Gold has one stable isotope. It contains 79 protons and 118 neutrons.

If there are fewer than 118 neutrons, the proton repulsions will be too strong for the strong force. If there are more than 118 neutrons, the average p-n distance will be large enough that the glue will again be too weak to hold the nucleus toge ther.

8 0

3 years ago

For the reaction 3h2(g) + n2(g) 2nh3(g), kc = 9.0 at 350°c. calculate g° at 350°c.

miss Akunina [59]

When ΔG° is the change in Gibbs free energy

So according to ΔG° formula:

ΔG° = - R*T*(㏑K)

here when K = [NH3]^2/[N2][H2]^3 = Kc

and Kc = 9

and when T is the temperature in Kelvin = 350 + 273 = 623 K

and R is the universal gas constant = 8.314 1/mol.K

So by substitution in ΔG° formula:

∴ ΔG° = - 8.314 1/ mol.K * 623 K *㏑(9)

= - 4536

4 0

3 years ago

a_sh-v [17]

The writers of the Articles of Confederation wanted to preserve the states' sovereignty.

7 0

3 years ago