1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
san4es73 [151]
3 years ago
14

Pb has an atomic number of 82. It has an isotope Pb-207. The mass number is 207.

Chemistry
1 answer:
nikdorinn [45]3 years ago
5 0

Answer:

Number of protons = 82

Explanation:

Given data:

Atomic number of Pb = 82

Mass number of Pb-207 = 207

Number of protons = ?

Solution:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

Atomic number of Pb = number of protons or electrons

82 = number of protons or electrons

Mass number = Number of protons + number of neutron

207 = 82 + number of neutron

Number of neutrons = 207 - 82

Number of neutrons = 125

You might be interested in
Which of the following values best classifies a bond between 2 atoms as being ionic?
never [62]
The general rule followed is that if electronegativity difference is greater than 2, then it is considered an ionic bond. An ionic bond is a type of bond characterizing a transfer of electrons within a bond. Common examples are salts which adds that ionic bonds are common between a metal and a nonmetal. Therefore, the best answer from above is letter B.
4 0
3 years ago
Read 2 more answers
Potassium is located in the first group of the periodic table. Use this information to answer each question.
melamori03 [73]

Explanation:

potassium is metal

potassium 1

good conductors of thermal heat

3 0
3 years ago
Read 2 more answers
What is the difference between the 3p sublevel and the 4p sublevel?<br><br> On the periodic table
statuscvo [17]
The p sublevels are named 2p, 3p, and 4p since the p sublevel appears only starting the 2nd level. By the Aufbau principle, 3p will be filled first before 4p. This is because of the energy present on the level. 

Each of the p sublevel has 3 orbitals, allowing them to contain 6 electrons as each orbital may hold two. 
6 0
3 years ago
Please help I will reward Brainly . Thank you for the help in advance
bekas [8.4K]
Usually you just need to give it rest for 6-12 weeks. depending on how large it is surgery may be needed
5 0
3 years ago
A major component of gasoline is octane (C8H18). When liquid octane is burned in air it reacts with oxygen gas to produce carbon
Paraphin [41]

Answer:

The answer to your question is 0.4 moles of Oxygen

Explanation:

Data

Octane (C₈H₈)

Oxygen (O₂)

Carbon dioxide (CO₂)

Water (H₂O)

moles of water = ?

moles of Oxygen = 1

Balanced chemical reaction

                   C₈H₈  +10O₂  ⇒   8CO₂  +  4H₂O

              Reactant     Element     Products

                    8                 C                 8

                    8                 H                 8  

                   20                O               20  

Use proportions to solve this problem

                  10 moles of Oxygen ----------------- 4 moles of water

                    1 mol of Oxygen     ------------------ x

                    x = (4 x 1) / 10

                    x = 4 / 10

                    x = 0.4 moles of water

7 0
3 years ago
Other questions:
  • Which city had the highest temperature
    8·2 answers
  • Describe one conclusion made by Thomson that led to the development of the current atomic theory
    7·1 answer
  • Which rocky planets is the most different to Earth's? Why? mark you as brainlist
    5·2 answers
  • Need help asap! A 200 L balloon is blown up inside at 100 K. It is then taken outside in the hot sun and heated to 400K. What is
    10·2 answers
  • The lymphatic system collects<br> While in<br> the lymphatic system, the fluid<br> is called
    7·1 answer
  • HELPPP ANSWERS ????<br><br> A: 3<br> B: 2<br> C: 1<br> D: 4
    7·2 answers
  • Chloe’s teacher gives her and her lab partner soil samples from different parts of the city: the park, the area next to a pond,
    12·1 answer
  • How many grams are in 6.60 moles of ZnO?
    7·1 answer
  • A certain first-order reaction has a half-life of 25.2 s at 20°C. What is the value of the rate constant k at 60°C if the activa
    14·1 answer
  • What is a chemical reaction?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!