Answer:
In Dobereiner’s triads, elements were placed :
- According to increasing order of their atomic masses.
- Into groups which have similar chemical and physical properties.
- In each group there were three elements.
In Modern periodic table, elements are placed:
- According to increasing order of their atomic numbers.
- Into groups and these groups are assigned according to the numbers of valence electrons present in their valence shell.
Aspects of Dobereiner’s triads agreed with the modern periodic table
- Element of the same group will have similar chemical and physical properties.
Disagreement with the modern periodic table.
- Not all groups obeyed law of triads.
- On the basis of properties all known elements could not be classified into groups of triads.
I would go with radioactivity is controlled radiation from a nucleus
Answer:
The general formula for an acid is HnX where H stands for hydrogen, n stands for the number of hydrogen ions, and X stands for the monatomic or polyatomic ions ( since those are negative charged ions, they are called anions).
Explanation:
The general formula for an acid is HnX) where H stands for hydrogen, n stands for the number of hydrogen ions, and X stands for the monatomic or polyatomic ions ( since those are negative charged ions, they are called anions).
An example is H2SO4, also called sulfuric acid
It shows that H2SO4 has 2 hydrogen atoms, so in the formula HnX n=2
X fro H2SO4 is SO42-, it's a polyatomic ion. Since it has a negative charge of 2- it needs 2 hydrogen atoms to bind and form H2SO4
The answer is false.
That is the ticketing area is more secure than the area beyond the security check point is false rather than the area beyond security check point is more safe than the ticketing area.
There is more security in the area beyond security check point because of anti-terrorism actions .
There is less security on the ticketing area and more on security check point.
