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4 years ago

Electrons involved in bonding between atoms are __________________

1 answer:

5 0

The name given to these electrons are that they are valence electrons or binding electrons as these are directly involved in chemical Bonding and allow for different compounds to be made.

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Un elemento posee dos isótopos cuyos números de masa suman 68 y la semisuma de sus neutrones es 19. Determine el grupo de este e

katovenus [111]

Answer:

The element belongs to group 15 of the present periodic table

Explanation:

Isotopes have the same proton number, what differs is that they have different number of neutrons.

Now since the half-sum of their neutrons is 19, the total number of neutrons would be 19 * 2 = 38 neutrons.

Also, their masses add up to be 68, since the total mass equals sum of neutrons and sum of protons, this means that the total number of protons is 68-38 = 30

Since this is equal in both isotopes, this means that the proton number of the element is 30/2 = 15

The atomic number is the number of protons in the nucleus of an atom. Since the atomic number is 15, this element is phosphorus and it belongs to group 15 of the present periodic table

5 0

3 years ago

What is the term for a solid that forms when two liquids are mixed together

MrRissso [65]

The correct answer would be C. a precipitate
Hope this helped!

5 0

3 years ago

Read 2 more answers

The heat capacity of water is 1cal degree'g1 (1 calorie per degree centigrade, per gram). You are given 1 gallon of water at 25

sdas [7]

Answer:

The heat needed to boil 1 gallon of water is 81,490.62 Joules.

Explanation:

$Q=mc\Delta T$

Where:

Q = heat absorbed or heat lost

c = specific heat of substance

m = Mass of the substance

ΔT = change in temperature of the substance

We have :

Volume of water = V = 1 gal = 4546.09 mL

Density of water , d= 1 g/mL

mass of water = m = d × V = 1g/mL × 4546.09 mL = 4546.09 g

Specific heat of water = c = 1 Cal/g°C

ΔT = 100°C - 25°C = 75 °C

9 (boiling pint of water is 100°C)

Heat absorbed by the water to make it boil:

$Q= 4546.09 g\times 1 Cal/g^oC\times 75^oC=340,956.75 Cal$

1 calorie = 4.184 J

$Q=\frac{340,956.75}{4.184} J = 81,490.62 J$

The heat needed to boil 1 gallon of water is 81,490.62 Joules.

5 0

3 years ago

Match the theoretical motions of particles with their associated phases. Solid, Gas, Liquid. 1. oscillation about a fixed point

viktelen [127]

The correct combination of theoretical motions of particles with their associated phases is given below:

1) Solid : oscillation about a fixed point . Because solids do vibrate (atoms/molecules of a solid oscillate around their mean positions)
2) Gas : translation, vibration, rotation. The gas molecules are free to rotate, oscillate & vibrate. 
3) Liquid: rotation and vibration. The liquid molecules are free to rotate & vibrate.

A more clear pictures (at atomic & molecular level is shown below):

4 0

3 years ago

Read 2 more answers

Describe how electron arrangements are given using electron configurations.

emmainna [20.7K]

According to the principle, electrons fill orbitals starting at the lowest available energy states before filling higher states (e.g., 1s before 2s). The Madelung energy ordering rule: Order in which orbitals are arranged by increasing energy according to the Madelung Rule.

I hope u understand

3 0

3 years ago