Elements are those substances that contains atoms that are indivisible by any chemical means.
The properties of these elements varies in a particular manner, therefore they are distributed into groups.
Based on the descriptions from the question, the groups are:
- Group 7: Chlorine is a highly reactive gas found in group 7 because it contains seven valence electrons in its outermost shell.
- Group 1 : Potassium is an extremely reactive metal found in group 1 because it contains only one valence electron in its outermost shell.
- Group 4: Silicon is a metalloid that belongs to group 4 because it contains four valence electrons in its outermost shell.
- Group 2: Calcium belongs to group 2 because it contains two valence electrons in its outermost shell.
- Group 0: Neon is an inert gas found in group 0 because its outermost shell is completely filled up.
- Group 3: Aluminum is the most abundant metal found in he earth crust which belongs to group 3. This is because it contains only 3 valence electrons in its outermost shell.
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Answer:
This is true I think.
Explanation:
water absorbs heat and the earth is covered in water.
A Intron is a segment of a DNA or RNA molecule which does not code for proteins and interrupts the sequence of genes. A exon is An exon is any part of a gene that will encode a part of the final mature RNA produced by that gene after introns have been removed by RNA splicing. Hope this helped:)
Answer: amphibians
Explanation:
earthworms, grasshopper, lancelets, octopus, crab, tunicates, starfish are all invertebrates.
lancelets(cephalochordata) and tunicates(urochordata) are chordates but do not have a backbone.