It's changing a thing with force, not chemicals, like cutting paper
Usually, elements which share the same group, they have similar properties, here only Lithium and sodium share same group as they both are alkali metals.
So, In short, Your Answer would be option B) Lithium and Sodium
Hope this helps!
Answer:
Explanation:
the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
the total number of protons and neutrons in a nucleus.
to write the symbol for an isotope, place the atomic number as a subscript and the mass number (protons plus neutrons) as a superscript to the left of the atomic symbol
Answer: none
Explanation: because mercury is not far as you think it is actually quite short of a distance..
Answer:
6.56 × 10²² atoms Xe
Explanation:
Step 1: Find conversions
Molar Mass Xe - 131.29 g/mol
Avagadro's Number: 6.022 × 10²³
Step 2: Use Dimensional Analysis
= 6.55911 × 10²² atoms Xe
Step 3: Simplify
We have 3 sig figs.
6.55911 × 10²² atoms Xe ≈ 6.56 × 10²² atoms Xe
