9. oxygen has an atomic number of 8.
- how many protons does it have? ______
- how many electrons does it have? ______
10. compare sodium (na) and chlorine (cl) using the periodic table:
- which one is metal? ______
- which one is nonmetal? ______
- when combined, what type of compound do they form? ______
11. explain why elements in the same group (like lithium, sodium, potassium) react in similar ways.
12. imagine you discovered a new element with 3 protons.
- what would the element’s name be? ______
- which group/family would it belong to? ______

Question

9. oxygen has an atomic number of 8.
   - how many protons does it have? ______
   - how many electrons does it have? ______
10. compare sodium (na) and chlorine (cl) using the periodic table:
   - which one is metal? ______
   - which one is nonmetal? ______
   - when combined, what type of compound do they form? ______
11. explain why elements in the same group (like lithium, sodium, potassium) react in similar ways.
12. imagine you discovered a new element with 3 protons.
   - what would the element’s name be? ______
   - which group/family would it belong to? ______

Accepted Answer

### Question 9
#### How many protons does oxygen have?
# Explanation:
## Step1: Recall the definition of atomic number
The atomic number of an element is equal to the number of protons in its nucleus.
## Step2: Apply the atomic number of oxygen
Oxygen has an atomic number of 8, so the number of protons is equal to its atomic number.
# Answer: 8

#### How many electrons does oxygen have?
# Explanation:
## Step1: Recall the neutral atom electron - proton relationship
In a neutral atom, the number of electrons is equal to the number of protons.
## Step2: Use the number of protons of oxygen
We know from the previous part that oxygen has 8 protons, so a neutral oxygen atom will have 8 electrons.
# Answer: 8

### Question 10
#### Which one is metal?
# Brief Explanations:
Metals are elements that are generally good conductors of heat and electricity, are malleable and ductile, and are found on the left - hand side and in the middle of the periodic table. Sodium (Na) is in Group 1 (alkali metals) of the periodic table, and it exhibits metallic properties. Chlorine (Cl) is a non - metal.
# Answer: Sodium (Na)

#### Which one is non - metal?
# Brief Explanations:
Non - metals are elements that are generally poor conductors of heat and electricity, are brittle, and are found on the right - hand side of the periodic table. Chlorine (Cl) is in Group 17 (halogens) of the periodic table, and it shows non - metallic properties. Sodium (Na) is a metal.
# Answer: Chlorine (Cl)

#### When combined, what type of compound do they form?
# Explanation:
## Step1: Identify the types of elements
Sodium is a metal and chlorine is a non - metal.
## Step2: Recall the type of compound formed by metal - non - metal combination
When a metal and a non - metal combine, they form an ionic compound. Sodium (Na) will lose one electron to form $Na^+$ and chlorine (Cl) will gain one electron to form $Cl^-$, and the electrostatic attraction between $Na^+$ and $Cl^-$ forms an ionic bond, resulting in the ionic compound sodium chloride ($NaCl$).
# Answer: Ionic compound (e.g., sodium chloride, $NaCl$)

### Question 11
# Brief Explanations:
Elements in the same group of the periodic table have the same number of valence electrons. For example, lithium (Li), sodium (Na), and potassium (K) are all in Group 1 of the periodic table, and they each have 1 valence electron. The chemical reactivity of an element is mainly determined by the number of valence electrons. Since these elements have the same number of valence electrons, they tend to react in similar ways. For instance, they all react vigorously with water to produce hydrogen gas and an alkaline solution, and they all tend to lose their single valence electron to form +1 cations.
# Answer: Elements in the same group (like lithium, sodium, potassium) have the same number of valence electrons. The chemical behavior of an element is largely determined by the number of valence electrons, so elements with the same number of valence electrons react in similar ways.

### Question 12 (assuming the element has 3 protons)
#### What would the element’s name be?
# Explanation:
## Step1: Recall the relationship between atomic number and element identity
The atomic number of an element is equal to the number of protons in its nucleus. The element with an atomic number of 3 is lithium (Li).
## Step2: Confirm the element with 3 protons
Since the number of protons is 3, the atomic number is 3, and the element is lithium.
# Answer: Lithium (Li)

#### Which group/family would it belong to?
# Explanation:
## Step1: Recall the group of lithium
Lithium (Li) is in Group 1 of the periodic table. Group 1 elements are known as alkali metals.
## Step2: Determine the group based on atomic number and properties
Elements with an atomic number of 3 (lithium) have 1 valence electron, which is a characteristic of Group 1 elements. So it belongs to Group 1 (alkali metals).
# Answer: Group 1 (alkali metals)

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Question 9

How many protons does oxygen have?

Step1: Recall the definition of atomic number

Step2: Apply the atomic number of oxygen

Step1: Recall the neutral atom electron - proton relationship

Step2: Use the number of protons of oxygen

Answer:

How many electrons does oxygen have?