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3 years ago

Which element’s atoms have the greatest average number of neutrons? germanium (Ge) arsenic (As) selenium (Se) bromine (Br)

1 answer:

5 0

The answer is selenium (Se)
selenium is a non metallic chemical element, member of the group 16 of the periodic table. Its atomic number 34 having 34 protons, 45 neutrons and 34 electrons. Its similar to sulphur in its form and compounds, converts light into electricity and decreases in electrical resistance with increased illumination among others.

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The star Betelgeuse is 20 times more massive than the sun. What would be the likely impact on the motion of Earth if the sun wer

Nataliya [291]

<span>Orbital radius would decrease because the gravitational pull would increase.</span>

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4 years ago

Read 2 more answers

A frictionless piston–cylinder device contains 7 kg of nitrogen at 100 kPa and 250 K. Nitrogen is now compressed slowly accordin

lora16 [44]

Answer: -1038.8 kJ

Explanation:

From the question, we can see that PV^n = constant. And as such, we can deduce that it is a polytropic process. Thus, we can use the polytropic work equation to calculate the needed work input.

from the question we were given

Mass of nitrogen, m = 7kg

initial temperature, T1 = 250k

Final temperature, T2 = 450k

Polytropic index, n = 1.4

Specific gas constant, R = 0.2968kJ/kgK

W = [p2 * v2 - p1 * v1] / 1 - n

W = [m * R * T2 - T1] / 1 - n

W = 7*0.2968*(450 - 250)] / 1 - 1.4

W = [7*0.2968*200] / -0.4

W = 415.52 / -0.4

W = -1038.8 kJ

5 0

3 years ago

Suppose we have three hypothetical atomic nuclei: A, B, and C. Nucleus A has 7 protons and 7 neutrons. Nucleus B has 5 protons a

alina1380 [7]

Answer:

Nucleus A with 7 protons and 7 neutrons and Nucleus C with 7 protons and 5 neutrons are isotopes of the same elements

Explanation:

Isotopes are elements that have the same atomic structure but different molecular structure. An atom that has the same atomic number but different mass number are known to be isotopes.

The proton of an atom is the same as its atomic number while the sum of the proton and neutron is equal to its mass number.

According to the question, nuclei that has the same number of proton are isotopes of the same element. Therefore nuclei A and C with 7 protons each are isotopes of the same element since they have the same atomic number i.e number of proton = atomic number.

Their atomic masses of nuclei A and C are 14 and 12 respectively

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3 years ago

Ado makes a table to identify the variables used in the equations for centripetal acceleration. What qualities belong to x and y

Thepotemich [5.8K]

Answer:

X Period

Y tangential speed

Explanation:

7 0

3 years ago

The centers of a 15 kg lead ball and a 90 g lead ball are separated by 11 cm. part a what gravitational force does each exert on

Black_prince [1.1K]

The gravitational force between the two objects is calculated through the equation,

F = Gm₁m₂/d²

where F is the gravitational force, G is constant (equal to 6.67 x 10^-11), m₁ and m₂ are masses in kg and d is distance is meters.

Substituting the known values,

F = (6.67 x 10^-11)(15 kg)(0.090 kg)/ (0.11 m)²

F = 7.441 x 10^-9 N

ANSWER: 7.441 x 10^-9 N

8 0

3 years ago