This is true as some parts cannot be checked but the radioactive substances can be used in x-rays
Answer:
Electricity is made at a generating station by huge generators. The current is sent through transformers to increase the voltage to push the power long distances. The electrical charge goes through high-voltage transmission lines that stretch across the country.
Answer:
The number and the kinds of atoms in the compound
Explanation:
- A chemical formula of a compound contains symbols o the atoms of the elements present in the compound as well as the number of atoms of each element in the form of subscripts.
- Therefore it helps us to know the elements in a compound and the number of atoms in the compounds.
Answer : Option A) Sodium
Explanation : Sodium is the element which is most reactive tin the given options.
Sodium has the atomic number as 11, which is distributed in the atomic shells as 2-8-1.
So, it is clear that the outermost valence shell contains only one electron in sodium. To give away one electron and attain the octet state is easy for sodium. If it donates the electron it becomes a cation which is very reactive, as it gets a positive charge on itself.
Compared to the valency of the other atoms given here, Nickel has 2 valence electrons so it will be less reactive than Sodium.
Carbon has 4 valence electrons which is less than sodium and oxygen needs 2 electrons to be an octet which is also less.