Answer:
A particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons.
Explanation:
An element is a substance that is made entirely from one type of atom. ... A compound is a substance made from two or more different elements that have been chemically joined.
Answer:
We can predict or comment about reactivity of elements by taking into consideration their electronic configuration that imparts stability or un-stability to an atom.
Explanation:
Reactivity : It refers to the affinity of a substance to combine with other substance .
Elements are mainly of two types :
In terms of metals or non metals it can be defined as tendency to loose or gain electrons .
- On the basis of it ,we can easily make out or comment about the reactivity of element (metal or non metal ) .Like ,if an element has completely filled outermost shell or we can say have stable electronic configuration then it is already stable .Therefore , it won't react with any other element .
- But, if its outer shell isn't complete then in order to attain stability it will combine or react with other .Hence , we can say it will be quite reactive .
Answer:
a plasma membrane: an outer covering that separates the cell's interior from its surrounding environment. cytoplasm: a jelly-like cytosol within the cell in which other cellular components are found. DNA: the genetic material of the cell. ribosomes: where protein synthesis occurs.
Answer:
C) homologous; analogous
Explanation:
The relationship between of the bones in the forelimbs of penguins and seals is a homology.
Homology is the shared ancestry between a pair of structures - in this case the forelimbs- in different taxa - in this case penguins and seals-. The forelimbs of vertebrates is a common example of homologous structures because they derived from the same ancestral tetrapod structure.
On the other hand, the relationship between the pinguins flippers and the seals flippers is an analogy.
Structures of two different organisms with similar functionsare analogus if they are similar in function - in this case for swimming- due to convergent evolution but not due to common ancestry. Pinguins flippers and seals flippers have similar function but different ancestry, therefore they are analogous structures.
