Electronegativity is a chemical property which describes how well an atom can attract an electron to itself. Values for electronegativity run from 0 to 4. The difference in electronegativity (ΔEN) is used to predict whether a bond between atoms will be ionic or covalent. It can also be used to predict if the resulting molecule will be polar or nonpolar. If a bond was made between the two atoms shown below, would the bond be (1) covalent, i. e. ΔEN = ≤ 0.4, (2) polar covalent i. e. ΔEN > 0.4 and ≤2.0, or (3) ionic, i. e. ΔEN > 2.0? Enter 1 for covalent, 2 for polar covalent, 3 for ionic.

protactinium, francium

#protactinium

The outer electronic configuration is 6d^17s^2

So it will form polar covalent bond (2)

#Francium

Outer electronic configuration 7s^1

It will form ionic bond (3)

odds are decent that your handwriting right now looks a little bit different than it did five years ago, and will look different again in five more. when i look back through my notebooks from middle school to now, i see a long, slow progression from meticulous and teeny letters to bigger, sloppier ones, plus a few side detours: sometime in high school, for example, i decided those loopy cursive lowercase f’s were just the coolest, adopting them as the lone rep for cursive in my otherwise all-print handwriting.

explanation: