Admin Table of Contents
- 1 Which is the common chemical in bones teeth and chalk?
- 2 What is the Valency of an element with atomic number 20?
- 3 What are the 20 element on the periodic table?
- 4 Where are most of the bones in the body located?
- 5 Which is the smallest bone in the human body?
- 6 Where are the red and yellow bone marrow found?
Which is the common chemical in bones teeth and chalk?
calcium
Ninety-nine percent of the calcium in the human body is in the bones and teeth, the mineral parts of which are calcium phosphates. But mollusk shells are made of calcium carbonate, which is by far the most common and widely distributed compound of calcium, mostly in the form of limestone.
What is the Valency of an element with atomic number 20?
Valency Chart of Elements (first thirty)
| Element | Atomic Number | Valency |
|---|---|---|
| Calcium | 20 | 2 |
| Scandium | 21 | 3 |
| Titanium | 22 | 2,3,4 |
| Vanadium | 23 | 2,3,5,4 |
What elements are in hydroxyapatite a major compound in human bones and teeth?
Cards
| Term weight | Definition The measurement of the gravitational pull on an object is its |
|---|---|
| Term calcium, phosphorus, oxygen, hydrogen | Definition What elements are in hydroxyapatite, Ca5(PO4)3OH, a major compound in human bones and teeth? |
| Term energy | Definition The phrase “ability to do work” is a definition of |
What are the 20 element on the periodic table?
Calcium
The elements of the periodic table sorted by atomic number
| Atomic number | Name chemical element | Symbol |
|---|---|---|
| 18 | Argon | Ar |
| 19 | Potassium | K |
| 20 | Calcium | Ca |
| 21 | Scandium | Sc |
Where are most of the bones in the body located?
More than half of the bones in your body are actually located in your hands and feet. These bones are attached to many little muscles that give you very exact control over how you move your fingers and feet. Examples of the different kinds of joints in your body.
Where are the platelets and bone marrow located?
Platelets are small pieces of cells that help you stop bleeding when you get a cut. Red bone marrow is found in the center of flat bones such as your shoulder blades and ribs. Yellow marrow is made mostly of fat and is found in the hollow centers of long bones, such as the thigh bones.
Which is the smallest bone in the human body?
The smallest bone in the human body is called the stirrup bone, located deep inside the ear. It’s only about 3 millimeters long in an adult. The longest bone in the human is called the femur, or thigh bone.
Where are the red and yellow bone marrow found?
There are two types of bone marrow: red and yellow. Red bone marrow is where all new red blood cells, white blood cells, and platelets are made. Platelets are small pieces of cells that help you stop bleeding when you get a cut. Red bone marrow is found in the center of flat bones such as your shoulder blades and ribs.