A method of converting one unit of measurement to another, like liters to milliliters.
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!
a process where the scientists performing the research influence the results, in order to show a certain result
1. An____ionic____ bond forms when one atom gives up one or more electrons to another atom.
2. Atoms or molecules with a net electric charge due to the loss or gain of one or more electrons are ions.
3. A_covalent__bond involves the sharing of electron pairs between atoms, also known as a molecular bond. 4. When one pair of electrons is shared between two atoms, a single bond is formed. 5. When two pairs of electrons are shared between two atoms, a double bond is formed. 6. A polar covalent bond is a type of chemical bond where a pair of electrons is unequally shared between two atoms. As a result, one end of the molecule has a slightly negative charge and the other a slightly positive charge. 7. Atoms involved in a nonpolar covalent bond equally share electrons; there is no charge separation to the molecule. 8. A weak bond called a van der waals bond results from an attraction between a slightly positive region in a molecule and a slightly negative region in the same or a different molecule
For radioactive decay, we can relate current amount, initial amount, decay constant and time using:
N = No x exp(-λt)
Half-life = ln(2)/λ
λ = ln(2) / 5730
N/No = 80% = 0.8
0.8 = exp( -ln(2)/5730 x t)
t = 1844 years
