// Quantum Model - Electron Configuration Script
thepage="Atomic Theory - Electron Configuration"
//11/20/02-updated netscape 7
//refnumber=43
a=new Array()
epop=new Array()
lpop=new Array()
sum=new Array()
toporb=new Array()
showit=""
config=""
configstring=""
theanswer=""
astring=""
totales=0
highest=0
q=0
electrons=0
fullonly=0
ivalue=0
totales=0
totl=0
corrt=0
attempts=0
function clear(){
	clearansspot()
	for(j=0;j<=17;j++){
		document.forms[0].elements[j].value=""}
	attempts=0
	tried=0
}
function atom(name,sym){
	this.name=name
	this.sym=sym
}
product=new Array()
for(j=1;j<=10;j++){sum[j]=0;product[j]=0}
for(j=0;j<=20;j++){epop[j]=""}
occupancy=new Array()
splits=new Array()
occupancy[1]=new Array(2,2,6,2,6,2,10,6,"1s","2s","2p","3s","3p","4s","3d","4p")
splits[1]=new Array(1,1,3,1,3,1,5,3)
occupancy[2]=new Array(2,2,6,2,6,10,2,6,"1s","2s","2p","3s","3p","3d","4s","4p")
splits[2]=new Array(1,1,3,1,3,5,1,3)
orbitals=new Array()
orbitals[1]="1s"
orbitals[4]="2s"
orbitals[6]="2p"
orbitals[9]="3s"
orbitals[12]="3p"
orbitals[15]="3d"
orbitals[16]="4s"
orbitals[20]="4p"
pop=new Array()
special=new Array(222222222111111,222222222122222,"1s<SUP>2</SUP>2s<SUP>2</SUP>2p<SUP>6</SUP>3s<SUP>2</SUP>3p<SUP>6</SUP>4s<SUP>1</SUP>3d<SUP>5</SUP>","1s<SUP>2</SUP>2s<SUP>2</SUP>2p<SUP>6</SUP>3s<SUP>2</SUP>3p<SUP>6</SUP>4s<SUP>1</SUP>3d<SUP>10</SUP>")
ansphrase=new Array(" has a total of "," electrons. Since this is ",", the electron configuration is ",".")
inserts=new Array(0," not a special case"," is a special case(transition metal cation)"," is a special case (24 or 29 electrons)") 
a[1]=new atom("hydrogen","H")
a[2]=new atom("helium","He")
a[3]=new atom("lithium","Li")
a[4]=new atom("beryllium","Be")
a[5]=new atom("boron","B")
a[6]=new atom("carbon","C")
a[7]=new atom("nitrogen","N")
a[8]=new atom("oxygen","O")
a[9]=new atom("fluorine","F")
a[10]=new atom("neon","Ne")
a[11]=new atom("sodium","Na")
a[12]=new atom("magnesium","Mg")
a[13]=new atom("aluminum","Al")
a[14]=new atom("silicon","Si")
a[15]=new atom("phosphorous","P")
a[16]=new atom("sulfur","S")
a[17]=new atom("chlorine","Cl")
a[18]=new atom("argon","Ar")
a[19]=new atom("potassium","K")
a[20]=new atom("calcium","Ca")
a[21]=new atom("scandium","Sc")
a[22]=new atom("titanium","Ti")
a[23]=new atom("vanadium","V")
a[24]=new atom("chromium","Cr")
a[25]=new atom("manganese","Mn")
a[26]=new atom("iron","Fe")
a[27]=new atom("cobalt","Co")
a[28]=new atom("nickel","Ni")
a[29]=new atom("copper","Cu")
a[30]=new atom("zinc","Zn")
a[31]=new atom("gallium","Ga")
a[32]=new atom("germanium","Ge")
a[33]=new atom("arsenic","As")
a[34]=new atom("selenium","Se")
a[35]=new atom("bromine","Br")
a[36]=new atom("krypton","Kr")
function startit(){
	totl++
	attempts=0
	document.forms[0].total.value=totl
	document.forms[0].results.value=""
	clear()
	for(j=0;j<=20;j++){
		//epop[j]=""
		lpop[j]=0
		}
	element=Math.ceil(36*Math.random())
	charge=Math.floor(3*Math.random())
	if(Math.random()>.5){charge=-1*charge}
	present(element,charge)
	buildconfig(element,charge)
}
function present(element,charge){
symbol=a[element]['sym']
if(charge!=0){
	if(charge>0){showit=symbol+"<sup>"+charge+"+</sup>"}
	else{showit=symbol+"<sup>"+Math.abs(charge)+"-</sup>"}
}
else{showit=symbol}
}
function buildconfig(element,charge){
	if((element>20 & element<=30) & charge>0)q=2;
		else q=1;
	config=""
	electrons=element-charge;
	totales=electrons;
	if(electrons==24 || electrons==29 & charge<2){
		(electrons==24)?configstring=special[0]:configstring=special[1];
		(electrons==24)?config=special[2]:config=special[3];
		q=3;
		buildquest();
	}
	else{
	for(j=0;j<=7;j++){
		if(electrons>=occupancy[q][j]){
					lpop[j]=occupancy[q][j]
					electrons=electrons-occupancy[q][j]
					}
		else{
				lpop[j]=electrons
				electrons=0
				}
		config=config+occupancy[q][8+j]+"<sup>"+lpop[j]+"</sup>"				
		if(electrons==0){highest=j
				break;
				}
	}
	getsplits(highest,q)
}}
function halfd(electrons){
	fullonly=0
	if(Math.random()>.5)electrons=29;
	configstring="2222222221"
	electrons==24 ? configstring+=11111:configstring+=22222;
	for(j=0;j<=8;j++)document.forms[0].elements[j].value=2;
	document.forms[0].elements[9].value=1
	if(electrons==24)for(j=10;j<=14;j++)document.forms[0].elements[j].value=1;
	else for(j=10;j<=14;j++)document.forms[0].elements[j].value=2;
}	
function getsplits(level,type){
	filledorbs=0
	for(j=0;j<=level-1;j++)filledorbs+=splits[type][j];
	eused=2*filledorbs
	esleft=totales-eused
	if(esleft==(2*splits[type][level])){
		filledorbs+=splits[type][level]
		fullonly=1
		}
	else{
	fullonly=0
	orbcount=splits[type][level]
	for(j=1;j<=orbcount;j++)toporb[j]="";
	for(k=1;k<=2;k++){
		for(j=1;j<=orbcount;j++){
			if(esleft>0){
				toporb[j]++
				esleft--
				}
			}
		}
	}
	configstring=""
	for(j=1;j<=filledorbs;j++){
			if(type==2 & j>9)jump=1;
			else jump=0;
			if(type==2 & j==10)configstring+="0";
			configstring+="2";
			}
	if(fullonly==0){
	if(type==2)configstring+="0"
	for(j=1;j<=orbcount;j++)if(toporb[j]!=""){
			configstring+=toporb[j]
			if(type==2)jump=1;
			else jump=0;
			}
	}
	buildquest()
}
function buildquest(){
	thequest="Determine the electron configuration for "+showit		
	showquest(thequest)
	getanswer()
}
function ansstring(form){
	if(fullonly==0 & q!=3)finish=arrange();
	astring=""
	for(j=0;j<=17;j++){
		if(form.elements[j].value=="" & form.elements[j+1].value>=1)astring+="0";
		else astring+=form.elements[j].value;
	}
	//alert(astring)
	answer()
}
//thefollowing function will rearrange data in the highest unfilled subshell for form submission
function arrange(){
	startcell=0
	for(j=0;j<highest;j++)startcell+=splits[q][j];
	if(q==2)startcell++
	topmost=startcell+splits[q][highest]-1
	vals=new Array()
	for(j=startcell;j<=topmost;j++)vals[j]=document.forms[0].elements[j].value;
	for(j=startcell;j<=topmost;j++){
		for(k=j+1;k<=topmost;k++){
			if(vals[j]<vals[k]){
				store=vals[j];
				vals[j]=vals[k];
				vals[k]=store;
			}
		}
	}
	for(j=startcell;j<=topmost;j++)document.forms[0].elements[j].value=vals[j]
	return
}
function getanswer(){
	theanswer=showit+ansphrase[0]+totales+ansphrase[1]+inserts[q]+ansphrase[2]+config+ansphrase[3];
}	

function answer(){
	attempts++
	if(tried==1)alert("You're already done this one! Get a new question.")
	else{
	if(tried==2){totl++;document.forms[0].total.value=totl}
	if(astring==configstring){
		tried=1
		corrt++
		document.forms[0].correct.value=corrt
		document.forms[0].results.value="correct"
	}
	else{
		tried=2
		document.forms[0].results.value="incorrect"
		attempts++
	}
}}