The reactivity of an atom arises from __ the potential energy of the valence shell the average distance of the outermost electron shell from the nucleus the sum of the potential energies of all the electron shells the existence of unpaired electrons in the valence shell

If oxidation is taking place, what also must be occurring? electroplating corrosion electrolysis reduction

Since an element always has a different number of protons, the mass can indicate how many protons are in an isotope. TRUE FALSE

What is the value of the gas constant R, in units of $\frac {L-atm}{mol\cdot K}$ ? Report the value with at least three significant figures. Type answer: $\square $

Which equation is correctly balanced? $2K+Br2\rightarrow 2KBr$ $K+Br2\rightarrow 2KBr$ $2K+2Br2\rightarrow 2KBr$ $K+2Br2\rightarrow 2KBr$

Elements that form diatomic molecules include __

How many different types of subshells are there? 1(s) $5(s,p,d,f,z)$ $4(s,p,d,f)$ $3(s,p,d)$

Choose the formula for phosphate. a $PO_{4}^{3-}$ b $PO_{4}$ c $HPO_{4}^{2-}$

25. Write the Lewis structure for each element. (a) I (b) S (c) Ge (d) Ca

In art class students are mixing black and white paint to make gray paint. Sarah mixes 4 cups of black paint and 1 cup of white paint. Kayden mixes 5 cups of black paint and 2 cups of white paint. Use Sarah's and Kayden's percent of black paint to determine whose gray paint will be darker. Answer Attemptiout of 5 $Sarah's\quad percent\quad of\quad black\quad paint\quad (to\quad nearest\quad whole\quad number)=\square \% $ $Kayden's\quad percent\quad of\quad black\quad paint\quad (to\quad nearest\quad whole\quad number)=\square \% $ Sarah's gray paint will be darker. Kayden's gray paint will be darker. The two gray paints will be equally dark.

The electron configuration of nitrogen (N) is $1s^{2}2s^{2}2p^{3}$ th $1s^{2}2s^{2}2p^{4}$ $1s^{2}2s^{2}2p^{5}$ $1s^{2}2s^{2}2p^{6}$