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makvit [3.9K]
3 years ago
9

1. What trends do you see when considering total electrons, valence electrons (highest occupied energy level/outermost level ele

ctrons), periods, sublevels, blocks, and groups/ families?
Chemistry
2 answers:
NNADVOKAT [17]3 years ago
6 0
ELECTRON CONFIGURATION

Highest occupied energy level of an element

equal to the period 
for example, the highest occupied energy level of He is 1, Be is 2, Al is 3, Ca is 4, and Sn is 5
insens350 [35]3 years ago
5 0

Explanation:

Elements in the same group have the same number of valence electrons. Across a period left to right number of valence shell electrons increases but in the group this trend remains same means number of valence shell electrons are constant.

The atomic radius is increases from top to bottom in the group and decreases from left to right across a period.

Ionization enthalpy or energy increases across a period and decreases down the group. Ionization energy is the energy that requires to remove the outermost electron from the subshell.

Electronegativity decreases down the group because atomic number increases down the group and increases across a period.

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What is the average atomic mass of all of the naturally occurring isotopes of nickel in amu?
My name is Ann [436]
In general chemistry, isotopes are substances that belong to one specific element. So, they all have the same atomic numbers. But they only differ in the mass numbers, or the number of protons and neutrons in the nucleus. In a nutshell, they only differ in the number of neutrons.

For Nickel, there are 5 naturally occurring isotopes. Their identities, masses and relative abundance are listed below

  Isotope                Abundance           Atomic Mass
   Ni-58                    68.0769%              <span>57.9353 amu
   Ni-60                    </span>26.2231%              <span>59.9308 amu
   Ni-61                    </span>1.1399 %               <span>60.9311 amu
   Ni-62                    </span>3.6345%                <span>61.9283 amu
   Ni-64                    </span>0.9256%                <span>63.9280 amu

To determine the average atomic mass of Nickel, the equation would be:
Average atomic mass = </span>∑Abundance×Atomic Mass

Using the equation, the answer would be:
Average atomic mass = 57.9353(68.0769%) + 59.9308(26.2231%) + 60.9311(1.1399%) + 61.9283(3.6345%) + 63.9280(0.9256%)

Average atomic mass = 58.6933 amu
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Calculate the freezing point of a solution that contains 8.0 g of sucrose (C12H22O11) in 100 g of H2O. Kf for H2O = 1.86C/m
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The freezing point of the sucrose solution is -0.435°C.

<h3>What is the freezing point of the solution?</h3>

The freezing point of the solution is determined from the freezing point depression formula below:

  • ΔT = mKf(H₂O)

Kf(H₂O) = 1.86 Cm

m is molality of solution = moles of solute/mass of solvent

moles of sucrose = 8.0/342.3 = 0.0233 moles

m = 0.0233/0.1 = 0.233 molal

ΔT = 0.233 m * 1.86°C/m.

ΔT = 0.435 °C.

Freezing point of sucrose solution = 0°C - 0.435°C

Freezing point of sucrose solution  = -0.435°C.

In conclusion, the freezing point of sucrose solution is determined from the freezing point depression.

Learn more about freezing point depression at: brainly.com/question/19340523

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