Answer:
potassium (K) and bromine (Br)
Explanation:
- Periodic table is a table of elements in terms of rows and columns in terms of their chemical and physical properties.
- Elements in the same group or columns have similar physical and chemical properties. For example, elements in the same group have the same number of valence electrons or valency.
- Elements in the same period or rows have similar number of energy levels. For example, potassium and bromine belong to the same period in the periodic table and thus have the same number of energy levels.
I believe a possible Lewis dot structure that does not obey the octet rule, where all elements are required to have 8 electrons in their outermost shell, would be the SF4 molecule.
Sulfur can contain an more than 8 electrons, in this molecule and thus has an expanded octet.
Answer: 17) d. ![C_2H_6](https://tex.z-dn.net/?f=C_2H_6)
18. c. The empirical formula of a compound can be twice the molecular formula.
Explanation:
Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.
Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.
To calculate the molecular formula, we need to find the valency which is multiplied by each element to get the molecular formula.
The equation used to calculate the valency is:
![n=\frac{\text{molecular mass}}{\text{empirical mass}}](https://tex.z-dn.net/?f=n%3D%5Cfrac%7B%5Ctext%7Bmolecular%20mass%7D%7D%7B%5Ctext%7Bempirical%20mass%7D%7D)
The empirical mass can be calculated from empirical formula and molar mass must be known.
17. Thus the empirical formula of
should be ![CH_3](https://tex.z-dn.net/?f=CH_3)
18. The molecular formula will either be same as empirical formula or is a whole number multiple of empirical formula. Thus the empirical formula of a compound can never be twice the molecular formula.
Answer:
sodium has a lower electronegativity:)
Explanation: