Please help with Atom composition

A. 35Cl-

Explanation:

According to the electron for diagram attached to this question, a neutral chlorine atom i.e with a charge of 0, is shown to contain 7 valence electrons in its outermost shell. This means that in order for chlorine to have a stable arrangement of eight valence electrons, it must gain one more electron.

Gaining one more electron, for a neutral chlorine atom, means that it now becomes an atom with one negative charge i.e. an anion (Cl-). Therefore, based on the attached diagram, the symbol "35Cl-" shows a chlorine atom that have a stable arrangement of eight valence electrons.

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ans.

dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'