Elements In the same group or family in the periodic table have the same number of valence electrons.
For example the halogens all have 7 valence electrons in their outermost electron shell.
Some studies suggest that babies placed in full-time child care before 3-5 years of age are more likely to display insecure attachment in the strange situation. <span>Attachment is the emotional bond between the child and the parent. Hope this answers the question.</span>
A confounding variable refers to an external effect, which modifies the influence of an independent and dependent variable. This extraneous effect is used to affect the outcome of an experimental design. The confounding variables can ruin the experiment and can generate unnecessary outcomes.
In the given case, confounding variables can be introduced by testing multiple hypotheses at a time and by using distinct kinds of soil in each of the samples.
