<em>the element which is used for protection from radioactive substances is <u>lead ..
</u>its symbol is Pb..
<u>atomic number of lead is 82..
melting point is 327.5 degree C
boiling point is 1750 degree C..</u></em>
The concentration of a solution refers to its macroscopic property, represents the amount of solute dissolved in a unit amount of solvent or of the solution, and can be expressed in a variety of ways such as qualitatively (dilute, concentrated) and quantitatively ( saturated, unsaturated.)
Answer:
Carbon has 6 electrons in the outside and 6 protons inside.
Explanation:
Carbon has a mass number A = 12 and an atomic number Z = 6. The latter means that the element has 6 protons inside and 6 electrons in the nucleus that neutralize said positive charge.
Answer :
(a) 0.0152
(b) 0.0000000778
(c) 0.000001
(d) 1600.1
Explanation :
Scientific notation : It is the representation of expressing the numbers that are too big or too small and are represented in the decimal form with one digit before the decimal point times 10 raise to the power.
For example :
5000 is written as
889.9 is written as
In this examples, 5000 and 889.9 are written in the standard notation and and are written in the scientific notation.
(a)
The standard notation is, 0.0152
(b)
The standard notation is, 0.0000000778
(c)
The standard notation is, 0.000001
(d)
The standard notation is, 1600.1
Both have Giant Covalent Structures, resulting in very high melting temperatures. However each carbon atom in Diamond has 4 covalent bonds with other Carbons, making it extremely strong and hard. On the other hand, each carbon in graphite is bonded to three carbons, and therefore graphite is formed in layers.