What is the half life of a radioactive isotope that decreased to one-fourth its original amount in 100 year

Which of these metals are magnetic?

How many electrons in an atom could have these sets of quantum numbers? =3n=3 electronselectrons =4,ℓ=2n=4,ℓ=2 electronselectrons =6,ℓ=ℓ=−1n=6,ℓ=2,mℓ=−1

The junction rule describes the conservation of which quantity? note that this rule applies only to circuits that are in a steady state.