Question

part 1: elements and symbols
each element has a one- or two-letter symbol. the first letter is always capitalized, and the second letter (if present) is lowercase.
a. write the chemical symbol for each element:

1. hydrogen: _______
2. oxygen: _______
3. sodium: _______
4. chlorine: _______
5. calcium: _______

b. write the element name for each symbol:

1. k: ____________________
2. mg: ____________________
3. n: ____________________
4. al: ____________________

Explanation:

Part A: Write the chemical symbol for each element

1. Hydrogen: $H$ (Hydrogen's chemical symbol is a single capital letter $H$ as per the element symbol naming convention where the first letter is capitalized and there's no second letter here.)
2. Oxygen: $O$ (Oxygen has a single - letter symbol with the first letter capitalized, so it's $O$.)
3. Sodium: $Na$ (Sodium's symbol comes from its Latin name "Natrium", so it is a two - letter symbol with the first letter capitalized and the second lowercase, $Na$.)
4. Chlorine: $Cl$ (Chlorine has a two - letter symbol. The first letter $C$ is capitalized and the second letter $l$ is lowercase, so it's $Cl$.)
5. Calcium: $Ca$ (Calcium has a two - letter symbol. The first letter $C$ is capitalized and the second letter $a$ is lowercase, so it's $Ca$.)

Part B: Write the element name for each symbol

1. $K$: Potassium (The symbol $K$ is the chemical symbol for Potassium, which comes from its Latin name "Kalium".)
2. $Mg$: Magnesium (The symbol $Mg$ represents Magnesium. The first letter $M$ is capitalized and the second letter $g$ is lowercase, and this symbol corresponds to Magnesium.)
3. $N$: Nitrogen (The single - letter symbol $N$ is used for Nitrogen, with the first letter capitalized.)
4. $Al$: Aluminum (The symbol $Al$ is for Aluminum. The first letter $A$ is capitalized and the second letter $l$ is lowercase.)

Answer:

s
A. 1. $H$; 2. $O$; 3. $Na$; 4. $Cl$; 5. $Ca$
B. 6. Potassium; 7. Magnesium; 8. Nitrogen; 9. Aluminum