How do you find the number of neutrons if you know the number of electrons?

The units of resistivity don't come out right.

10^-8 Ohm * m
or
m Ohm * cm

the 'm' should be a 'mu', but unfortunately they both look the same in the latin alphabet.

The giant gypsum crystals in Mexico's "Cueva de los Cristales" are a stunning natural wonder featuring crystals up to 11 metres long.

Hello,

I am a first semester chemistry student in college taking Chem-1406 Essential/General Chemistry. I am working on an extra credit assignment that is supposed to be 22 slides long done in powerpoint. Well he gives us the criteria he wants on each slide about an element of our choosing but I am a little confused on what he means by "Properties" of calcium. Does he mean the subatomic particles or something else? Also he ask us to list the row in which our element is located. I don't know "rows" but I do know the groups and periods. Does "Row" fall into one of these two items?

Thank You,

Bone tissue contains a massive mineral phase and is unique from other tissue in the body. As a result of this, bone requires a different type of protein treatment, which has significant side effects to the rest of the body. Therefore, any treatment must be delivered specifically to bone and not target other tissues.

Biphosphonates are a class of material that have a strong affinity for bone matter. Although other molecules can also be used, Biphosphonates are thought to have more flexibility for use in bone delivery systems. These molecules can be linked to protein molecules to ensure delivery only to bone tissues. The target efficiency can be increased by attaching more phosphate molecules to each of the protein chains. Earlier studies have shown that complexes of Biphosphonate molecules show no decrease in bone seeking capabilities. Another advantage of this type of treatment is that the potency will increase without an increase in the dosage.

ok im doing a science fair project and im testing the amounts of calcium carbonate in eggs. so im looking for anything and everything on eggs or calcium. thankyou

z-train

The Group 2 elements are called the alkaline earth metals. The Group 2 elements are:

• Beryllium
• Magnesium
• Calcium
• Strontium
• Barium
• Radium

The electronic configuration of the elements all consist of two s-electrons outside an inner core of electron corresponding to the previous inert gas: the group configuration is therefore ns².

The Science Blog report here that Virginia Tech (USA) researchers found that calcium intake among US adolescents has remained constant, if inadequate, since the 1970s and does not appear to be linked to soft drink consumption. Milk consumption among adolescent girls is low, with this group falling far below recommended dietary levels of calcium consumption. So drink some milk!