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When there is nothing in a place, it's called a vacuum. Space is mostly vacuum.

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What happens when you mix phosphorus with other elements?

When phosphorus reacts with other elements, it forms compounds such as phosphates, phosphides, and phosphorus oxides. These compounds have various properties depending on the specific elements involved in the reaction. For example, phosphorus reacts with oxygen to form phosphorus pentoxide, a white solid used in chemical synthesis.


What happens where two elements have the same atomic number?

When two elements have the same atomic number, it means they are isotopes of each other. Isotopes have the same number of protons but different numbers of neutrons in their nuclei. This results in subtle differences in their atomic mass and stability.


What is 3 quarters of the 90 naturally occurring elements?

3 quarters of the 90 naturally occurring elements are called metals.


What happens to the reactivity of elements in a group labeled A as atomic numbers increase across period?

In a group labeled as A, as atomic numbers increase across a period, the reactivity of elements generally decreases. This is because as you move from left to right across a period, the elements have more protons in the nucleus, which leads to stronger nuclear charge and less tendency to lose electrons and react with other elements.


What are used to show what happens during a chemical reaction?

Chemical equations are used to show what happens during a chemical reaction. They demonstrate the reactants that are used, the products that are formed, and the balanced relationship between them. Symbols and formulas represent the different elements and compounds involved in the reaction.