<span>NH4+ and NO3- because barium phosphate is insoluble </span>
isotopes have the same atomic number because they are the same element but have a different atomic mass because they contain a different number of neutrons.
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The temperature of internal organs of a dead body and the environmental temperature at the scene of death are important to consider in determining the time of death.
These atoms and other atoms in group 8A have constant valence shell.it means that all of them have 8 electrons in their valence shell (except helium that has only 2 electrons )and they don't want to attract electrons.
that s why they don't have electronegativity.
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