Nucleic Acids, Protein Coat,and Lipid Membrane
Explanation:
The octet rule is a rule that governs how atoms combines with each other. It postulates that atoms will prefer to have the stable configuration of noble gases by having eight electrons in their outermost shell.
Compounds forms when atoms combines to attain stability. The atoms of some elements shows no tendency to combine with themselves or other kinds of atoms because their outer energy levels are completely filled.
The driving force for many interatomic bonding is the tendency to have completely filled outer energy levels like the noble gases.
The various interatomic bonds are formed in the bid of the atoms to be isoelectronic in the outer energy level with the noble gases.
This more stable form may be achieved by losing, or gaining electrons or the sharing of pairs of electrons.
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.4 M means that in 1 Liter of solution there are .4 moles.
Molarity x Liters = Moles
We have molarity, so convert mL to liters
250 mL x 1000mL/1 Liter = .25 L
Now, set up the equation
.4 M x .25 L = .1 moles of solute
Answer: 27 neutrons
Explanation:
Recall that the number of protons in the nucleus of an atom = Atomic number.
Hence, Calcium with mass number 47 and atomic number 20 will have 20 protons
Therefore, since Mass number = number of protons + neutrons
47 = 20 + neutrons
Neutrons = 47 - 20 = 27
Thus, there are 27 neutrons in radioactive calcium nucleus.
