The half-life of a radioactive isotope, X, is 2.00 years. How many years would it take a 4.000 g sample of X to decay and have only 0.500 g of X remain?

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

The missing component to the table to the right or indicated with orange letters complete the table by filling in the corresponding numbers or symbols

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions