There are two nitrogen atoms in Aspartame. One is a primary N in R-NH3, while the other is a secondary N in R-NH-R (R represents the rest of the carbon structure). Since both N has three substituents in addition to the already present lone pair, they both have 4 groups attach to them. Thus, they are both sp3 hybridization.
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These bonds are covalent.
A Krypton atom has 36 protons and 36 electrons each.
To draw the Lewis structure of 2CO2, you first need to determine the total number of valence electrons. Each oxygen atom contributes 6 valence electrons, and each carbon atom contributes 4 valence electrons, for a total of 16 + 4 = 20 valence electrons. Place the carbon atom in the center, surrounded by two oxygen atoms. Each oxygen atom forms a double bond with the carbon atom, using 4 electrons each. This leaves 4 electrons to be placed as lone pairs on each oxygen atom to satisfy the octet rule.
Bohr theory was introduced using hydrogen atom, it's not applicable to each and every atom, even for the other isotopes of hydrogen.
You are PROBABLY referring to the "Bohr Model" of the atom.