A neutral atom of iron has a mass number of 56 and an atomic number of 26. How many protons, electrons and neutrons are in this atom? Explain how you determine each number.
Answers
mass no. = 56
and atomic no. = 26
=> in an atom there is an equal number of electrons and protons ...(e=p)..
=> also atomic number is the number of the electrons or protons ..
=> so here we got the no. of electrons and protons ..which is 26 ..
=> to find the number of neutrons in an atom , subtract atomic number from the mass number..i.e, 56 - 26 = 30 ...
=> so there are 26 electrons , 26 protons and 30 neutrons in the given atom ...
Hope it helps !!!
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b) Compared to other options lead is less costly and is long lasting
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Explanation:
First step is Analyze .
Second is Calculating .
Third is Evaluate .
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Evaluation : After calculation , you need to evaluate whether the answer is reasonable or not? Does it make sense?Did you choose the right equation ?
It helps to round off the numbers and make an estimate of the answer.
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(2) Cr, Cl2, C (4) Se, Sn, Sr
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Periodic table contain element of various states like solid, liquid and gases. Thus the that list of elements contains a solid, a liquid, and a gas is HF, Hg, He. Hence option A is correct option.
What is periodic table?
Periodic table is a table in which we find elements with properties like metals, non metals, and metalloids
STP means standard temperature and pressure where temperature is 273.15 K and pressure is 1 bar. It is known that only bromine (Br) and mercury (Hg) are in liquid form at STP. Whereas noble gases like He, Ne, Ar are gases in nature.
HF - solid, Hg - liquid, and He - gas
Ba - solid, - liquid, and B - solid
Cr - solid, - gas, and C - solid
Se - solid, Sn - solid, and Sr - solid
Thus, we can conclude that list of elements contains a solid, a liquid, and a gas is HF, Hg, He. Hence option A is correct option
Learn more about periodic table, here:
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Answer: Option (1) is the correct answer.
Explanation:
STP means standard temperature and pressure where temperature is 273.15 K and pressure is 1 bar or 0.98 atm.
It is known that only bromine (Br) and mercury (Hg) are in liquid form at STP. Whereas noble gases like He, Ne, Ar etc are gases in nature.
Hence, given elements are differentiated as follows.
HF - solid, Hg - liquid, and He - gas
Ba - solid, - liquid, and B - solid
Cr - solid, - gas, and C - solid
Se - solid, Sn - solid, and Sr - solid
Thus, we can conclude that list of elements contains a solid, a liquid, and a gas is HF, Hg, He.
Answers
Answer:
record the data in writing
Explanation: