Match the following. 1. a positively charged ion; an atom which has lost an electron cation 2. a negatively charged ion; an atom which has gained an electron ph 3. the compound formed by the ionic bonding of a cation and anion salt 4. a measure of the hydrogen ion concentration in a solution anion

PH is the measure of hydrogen ions

A positive ion is a cation

A negative ion is an anion

1. a positively charged ion; an atom which has lost an electron - cation  

2. a negatively charged ion; an atom which has gained an electron - anion

3. the compound formed by the ionic bonding of a cation and anion - salt  

4. a measure of the hydrogen ion concentration in a solution - pH  

Explanation:

A normal atom has no charge or neutral charge because it has equal number of protons, positive particles and electrons, negative particles. But when a neutral atom loses an electron, it becomes ion with one positive charge. Positive charged atom is called cation. Similarly, when a neutral an atom on gaining an electron, becomes an ion with one negative charge. Negative charged atom is called anion. Cation and anion combined by an ionic bond to form a salt, example sodium chloride. pH is a measure of the hydrogen ion concentration in a solution.

the ems is the abbreviation for the emergency medical services. it is a service provided by a group of medical professionals specialised doctors and other healthcare staff.

any one can call 911 in case of any medical emergency and a group of health care professional will come and give the treatment required. every day the ems staff receive many phone call, which are related to different types of medical emergencies, out of which 25-28% are exclusively related to the respiratory issues.

so, the correct answer is 25-28%.