Solution: We are taking second element from the 4th period.
Element's name is Calcium.
It's symbol is Ca.
It is a metal because it looses its valence electron to form positive ions.
Calcium element lies in the second group of 4th period. The elements belonging to the second group are known as alkaline earth metals.
Atomic Number of Calcium = 20
Atomic number = Number of protons = Number of electrons
therefore,
Number of electrons and protons = 20
Atomic Mass of Calcium = 40
Atomic Mass = Number of neutrons + Number of proton
bu substituting the values of atomic mass and number of prtons, neutrons can be calculated
Number of neutrons = 20.
Hi,
The density is given by the ratio of mass to volume, so the density of the bread is 645g/3450cm3=0.187 g/cm^3.
Hope this helps! If my answer was not clear enough or you’d like further explanation please let me know. Also, English is not my first language, so I’m sorry for any mistakes.
Answer :]
to convert from g NaOH to mol NaOH. = 1.48 g NaOH are needed to neutralize the acid.
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Answer:
As with the hydrogen-ion concentration, the concentration of the hydroxide ion can be expressed logarithmically by the pOH. The pOH of a solution is the negative logarithm of the hydroxide-ion concentration. pOH=−log[OH−] The pH of a solution can be related to the pOH.