The Plum Pudding Model is a model of atomic structure proposed by J.J. Thomson in the late 19th century. Thomson had discovered that atoms are composite objects, made of pieces with positive and negative charge, and that the negatively charged electrons within the atom were very small compared to the entire atom.
 
        
             
        
        
        
The sample with the largest number of oxygen atoms will be calcium perchlorate.
<h3>Number of atoms in a compound</h3>
Since we are not looking at the number of moles, the mass of the compounds has no bearing on the number of atoms of oxygen.
- The chemical formula for carbon dioxide is  . Thus, it has 2 atoms of oxygen. . Thus, it has 2 atoms of oxygen.
- The chemical formula for potassium chlorate is  . Thus, it has 3 oxygen atoms. . Thus, it has 3 oxygen atoms.
- The chemical formula for calcium perchlorate is  . Thus, it has 8 atoms of oxygen. . Thus, it has 8 atoms of oxygen.
- The chemical formula for sodium hydroxide is NaOH. Thus, it has 1 atom of oxygen.
Therefore, the compound with the largest number of oxygen atoms is calcium perchlorate.
More on the number of atoms in compounds can be found here: brainly.com/question/1686912
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Answer :  La carga nuclear efectiva (Zef) es la carga positiva neta experimentada por un electrón en un átomo polielectrónico. El término "efectiva" se usa porque el efecto pantalla de los electrones más cercanos al núcleo evita que los electrones en orbitales superiores experimenten la carga nuclear completa
Explanation:
 
        
             
        
        
        
A control group is the group in an experiment that does not receive any sort of change, to then be compared to the other treated objects at the end of the study.