What is the nuclear symbol for the isotope of bromine?

Ascientist conducted an experiment and discovered that certain plants grow faster when given a particular amount of fertilizer. anouther scientist conducted the same experiment and got similar results. which concept does this best illustrate? a) repetition b) replication c) precision d) validity

Is the following chemical equation balanced? agno3 + nacl 4agcl + nano3 yes no

Why does 4.03/0.0000035 = 1.2 x 106, instead of a different number of significant figures?