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tester [92]
3 years ago
15

Atomic Structure of 14 Elements Please use the periodic table of elements to answer the questions below. How can you determine t

he number of protons in the nucleus of an atom of any of the elements listed in the table? Which element has 14 protons in the nuclei of its atoms? Explain how you can determine the number of electrons surrounding the nucleus of an atom of any of the elements listed in the table. Which element has 19 electrons surrounding the nuclei of its atoms? Explain how you can determine the number of neutrons in the nucleus of an atom of any of the elements listed in the table. Which element doesn’t have a neutron in the nuclei of its atoms? How many neutrons are present in the nucleus of an iron atom? How many protons, neutrons, and electrons are present in and surrounding the nucleus of a chlorine atom?
Chemistry
2 answers:
andrew-mc [135]3 years ago
7 0

Silicon has 14 protons Potassium has 19 electrons The neutrons are equal to the mass number minus the atomic number. Or the big number minus the small number on the periodic table. hydrogen 1 does not have a neutron.

iron =56 -26 for 30 neutrons in the nucleus

Chlorine 17 protons and 17 electrons. 18 or 19 neutrons on average.

Murljashka [212]3 years ago
4 0

1. From the atomic number, the number of protons in an atom’s nucleus.

2. Silicon

3. You can find this from the atomic number. An atom has no overall charge, so it must have an equal number of positive protons and negative electrons. Therefore, the number of electrons surrounding the nucleus must equal the number of protons found in the nucleus, which is the atomic number.

4. Potassium

5. The mass number of an atom of an element is the combined number of protons and neutrons. So, if you subtract the number of protons—equal to the atomic number—from an atom’s mass number, the result is the number of neutrons present in the nucleus.

6. Hydrogen

7. 30

8. 17 protons, 18 neutrons, 17 electrons

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Which of the following statements is incorrect? Group of answer choices The product of wavelength and frequency of electromagnet
morpeh [17]

Answer: Option (b) is the correct.

Explanation:

It is known that energy is directly proportional to frequency.

Mathematically,              E \propto \nu

or,                           E = h \times \nu ............ (1)

where,     E = energy

                h = Plank's constant

              \nu = frequency

This relation shows that higher is the energy then more will be the frequency of electrmagnetic radiation.

Also,     \nu = \frac{c}{\lambda} ......... (2)

where,          c = speed of light

                 \lambda = wavelength

Therefore, substituting value of \nu from equation (2) into equation (1) as follows.

                 E = h \times \nu

                 E = h \times \frac{c}{\lambda}

This relation shows that higher is the energy then lower will be the wavelength.

Thus, we can conclude that as the energy of a photon increases, its frequency decreases, is incorrect statement.

3 0
3 years ago
It usually takes Vaughn 12 minutes to drive to school. She drives an average of 50.0 miles per hour. What is the distance from s
lilavasa [31]
<h3>Answer:</h3>

  = 633,600 Inches

<h3>Explanation:</h3>

Speed refers to the rate of change in distance traveled by a body in motion.

It is the ratio of distance to time taken.

It is calculated by;

Speed = Distance ÷time taken

Therefore;

Distance = Speed × time

In this case;

Time taken = 12 minutes ( but 1 hr = 60 mins)

Thus, t = 0.2 hours

Speed = 50.0 miles/hour

Thus;

Distance = 50.0 miles/hr × 0.2 hours

               = 10 miles

But, we are require to give the distance in inches;

1 mile = 63360 Inches

Therefore;

10 miles = 10 × 63360 Inches

            = 633,600 Inches

6 0
3 years ago
What is a characteristic of a lewis base?
statuscvo [17]
A Lewis base is characterized as any species that can donate a lone pair of electrons the Lewis acid (which has a vacant orbital for the lone pair to bond with)

8 0
3 years ago
What is the iupac name of this structure?
alexgriva [62]

Answer:

3–ethyl–4–methylhexane.

Explanation:

To name the above compound, do the following:

1. Determine the functional group of the compound.

2. Locate the longest continuous carbon chain. This gives the parent name of the compound.

3. Identify the substituent group attached to the compound.

4. Give the substituent the lowest possible count.

5. Combine the above to name the compound.

Now, we shall name the compound given in the question above as follow:

1. The compound contains only single bond. Therefore, the compound belong to the alkane family.

2. The longest continuous carbon chain is 6 i.e hexane.

3. The substituent group attached are:

i. Methyl, CH3.

ii. Ethyl, CH2CH3.

4. we shall name the substituents alphabetically i.e ethly will come before methyl. Therefore,

Ethyl is located at carbon 3.

Methy is located at carbon 4.

5. Therefore, the name of the compound is:

3–ethyl–4–methylhexane.

5 0
2 years ago
Why is the following chemical equation said to be balanced? it's not A or B​
dmitriy555 [2]
Your answer should be d
8 0
3 years ago
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