The periodic table is an important but rather dry scientific tool. It lists all the chemical elements, ordered by their atomic numbers. Elements with similar behavior are grouped in the same column (called a group), with metals generally on the left and non-metals (gases) on the right. Rows are called “periods” - hence, periodic table.
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Cell Wall
Explanation:
In plant cells, the cell wall is rigid the outer structure that protects the plant cell.
Answer:
STP of 1atm and 273 k for pressure
<span>Technetium (TC)- Transition metal.Promethium (Pm)- Rare earth metal.<span>Polonium (Po)- Metalliod.
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Radioactivity tracers,</span>fission products,<span>controls fission reactions
</span><span>Isotopes are variants of a particular chemical element which differ in neutron number. All isotopes of a given element have the same number of protons in each atom.
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For example<span>, the </span>half-life<span> of a radioactive substance is the amount of time it takes for </span>half<span> of its atoms to decay, and the </span>half-life<span> of a drug is the amount of time it takes before </span>half<span> of the active elements are either eliminated or broken down by the body.</span>
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the number of electrons in a particular shell is given by the formula 2n^2 . However an electron when gets very exicited loose energy in the forms of radiation and comes in high energy level shell.