How many electrons are in Br-? A) 36 B) 4 C) 7 D) 34 E) none of the above 50: please help me with my right triangles & trigonometry homework. Can you explain to me what I have to do in order for me to turn it in tomorrow?
T he Correct Answer and Explanation is :
To answer your first question:
How many electrons are in Br⁻?
Correct answer: A) 36
Explanation
Let’s first understand what the question is asking. You’re asked how many electrons are in a bromide ion, written as Br⁻.
Step 1: Know the atomic number of bromine (Br)
The atomic number of bromine is 35. This means a neutral bromine atom has:
- 35 protons
- 35 electrons
Step 2: Understand what the negative sign (⁻) means
The minus sign (⁻) indicates that the atom has gained an extra electron, becoming a negative ion (anion). This happens when atoms want to achieve a stable electron configuration, often resembling the nearest noble gas (in this case, krypton).
So, if a neutral bromine atom has 35 electrons, then:
Br⁻ = 35 (original electrons) + 1 (gained) = 36 electrons
Therefore, the correct answer is:
A) 36
Tips for Your Right Triangles & Trigonometry Homework
For your trigonometry homework due tomorrow, focus on the basic trigonometric ratios used in right triangles:
- SOH-CAH-TOA helps you remember:
- Sine (sin) = Opposite / Hypotenuse
- Cosine (cos) = Adjacent / Hypotenuse
- Tangent (tan) = Opposite / Adjacent
- Use these steps:
- Identify the right triangle.
- Label the sides: opposite, adjacent, hypotenuse.
- Choose the correct trig ratio based on the sides you know and the side or angle you want to find.
- Use a calculator (make sure it’s in degree mode) for sin, cos, or tan.
- Solve the equation and check your answer.
- Example:
- If you know an angle is 30° and the hypotenuse is 10, to find the opposite side:
- Use: sin(30°) = opposite / 10
- 0.5 = opposite / 10 → opposite = 5
- If you know an angle is 30° and the hypotenuse is 10, to find the opposite side:
Good luck — and feel free to send a specific triangle problem if you want help solving it!
