Which statement OR statements are true about groups on the periodic table?

Elements in the same group have similar properties and react the same

Elements in the same group have the same number of energy levels

Groups are also called families

Elements in the same group have the same number of valence electrons

A,C,D

Explanation:

Element in the same group shared similar chemical behaviour and resemble each other because of the same number of valency electron they have. Example group one element have a valence electron of one.

Because of the same Valency electron they react in a similar way.

Example Group 1 have one valence electron and therefore Ionize readily to form positive electron this occur when they donate their valence electron leading to the formation of electrovalent compounds this is applicable for all group one element. Hence,

Elements in the same group have similar properties and react the same

Also, because element in the same group share the same property in chemical behaviour they are said to belong to one family.

Element in the same group do not have the same energy level because their electron tends to increases down the group and therefore energy level increases and not constant for all elements.

Option A,C and D.

Explanation:

Groups on the periodic table refer to elements on the same column on the table.

Elements on the groups in periodic tables have similar physical and chemical properties and similar electronic configurations.

Elements in the same group on the periodic table have the same number of electrons at their outer shell.

Groups are also called families. Because they have the same chemical properties.

The major groups on the periodic table are;

Group 1: Alkali metals like Sodium, calcium.

Group 2. Alkali Earth metals.

Group 11: coinage metals.

Group 15: Pnictogens.

Group 16: Chalcogens.

Group: 17: halogens like chlorine, flourine. Bromine.

Group 18: Noble gases like Argon, neon

a. the production of carbon dioxide through the process of photosynthesis

transcription is a process in which information is rewritten. it is something our cells must do, in a more specialized and narrowly defined way. in biology, transcription is the process of copying out the dna sequence of a gene in the similar alphabet of rna. it needs to happen in the nucleus because that's where the dna is. dna is always inside the nucleus unless the cell is dividing.

transcription is the first step in gene expression, which involves copying a gene's dna sequence to make an rna molecule. transcription is performed by rna polymerases. it has three stages: initiation, elongation, and termination. rna molecules must be processed after transcription in eukaryotes.

explanation:

long version:

the protein synthesis consists two processes which are, transcription and translation. transcription takes place in the nucleus. it uses dna as a template to make an rna molecule. rna then leaves the nucleus and goes to a ribosome in the cytoplasm, where translation occurs. transcription is the first part of the central dogma of molecular biology: dna → rna. it is the transfer of genetic instructions in dna to messenger rna (mrna). during transcription, a strand of mrna is made that is complementary to a strand of dna.  

these three stages are:

  initiation: in which   is the beginning of transcription.occuring when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

    elongation: in which is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

    termination: in which is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.