Question

In: Biology

1. Which of the following is true of electron shells? a. a shell is an energy...

1. Which of the following is true of electron shells?

a. a shell is an energy level of electrons at a characteristic average distance from the nucleus of the atom

b. a shell is the 3D space where an electron is found 90% of the time

c. all electron shells can hold the same number of electrons

d. the electrons in the first shell have more potential energy than the electrons in the valence shell

2. ¹⁴C is a radioactive isotope of carbon (atomic number 6). How many electrons are in the valence shell of ¹⁴C?

a. 4

b. 6

c. 8

d. 14

e. none thats why its radioactive

3. How many single covalent bonds can carbon form w other atoms?

a. 2

b. 3

c. 4

d. 5

e. 6

Expert Solution

Ans-1- a shell or a principle energy level is the orbit followed by the electrons with different energy level around the nucleus. Each shell has definite number of electrons. Potential energy of the last shell, that is valance shell is maximum.

So option A is correct answer.

Ans-2- main difference between C 14 and C 12 is that C 14 has 8 neutron while C 12 has only 6 electron. Like other element of group 14 carbon also have 4 valance electrons. So the number of electrons in balance shell is 4.

Ans-3- since there are 4 electrons in valance shell carbon can form 4 single covalent bonds with other atoms.

gladiator answered 2 years ago

electron shells

How many electrons does fluorine have? How many electron shells? Name the orbital that is occupied. How many electrons are needed to fill the valence shell?

Question 1 Which of the following is true about energy band diagrams? Select one: a. Electron...

Question 1 Which of the following is true about energy band diagrams? Select one: a. Electron energy increases as you go down in an energy band diagram b. Hole energy increases as you go up in an energy band diagram c. Electron energy below Ec and hole energy above Ev is in the form of kinetic energy d. Both electrons and holes seek the lowest possible energy level e. All of these Q2 In a semiconductor “dopant compensation” refers to...

Ch 2- what are atoms and matter elements of life energy levels and electron shells, chemical...

Ch 2- what are atoms and matter elements of life energy levels and electron shells, chemical reactions types of bonds and interactions between atoms or molecules elements and molecules exist, what is polarity functions and all properties of water, acids and bases, what is pH and equation of pH to determine acidity or alkalinity ch 3 carbon and its electron shells what are organic compounds, hydrocarbons and carbon skeletons types of isomers, how are enantiomers different structurally and functionally what...

Which statements are true for an electron in the 1s orbital of hydrogen ? 1. The...

Which statements are true for an electron in the 1s orbital of hydrogen ? 1. The potential energy of the electron is negative. 2. The total energy of the electron is constant. 3. The kinetic energy of the electron is positive.

Which of the following statements are true? 1.When a system loses energy its energy goes up...

Which of the following statements are true? 1.When a system loses energy its energy goes up TRUE or FALSE 2. When a system loses energy the surrounding\'s energy goes up TRUE or FALSE 3. A combustion reaction, like a candle burning, loses energy and so the surroundings get hot. TRUE or FALSE 4. In a chemical reaction, the \"system\" is the chemicals involved in the reaction and the \"surroundings\" is everything else. TRUE or FALSE 5. In a chemical reaction,...

Which of the following statements is false? Electron affinity is a measure of the energy evolved...

Which of the following statements is false? Electron affinity is a measure of the energy evolved when a gaseous atom gains an electron Anions are smaller than the parent atoms from which they are derived Ionization energies decrease as the atomic radius increases For isoelectronic cations, the higher the charge, the smaller the ion Cations are smaller than the parent atoms from which they are derived

A capacitor consists of two concentric spherical shells. The outer radius of the inner shell is...

A capacitor consists of two concentric spherical shells. The outer radius of the inner shell is a = 0.1 m and the inner radius of the outer shell is b = 0.2 m. a. What is the capacitance, C, of this capacitor? b. Suppose the maximum possible electric field at the outer surface of the inner shell before the air starts to ionize E max(r=a) = 3.0*10^6 V/m . What is the maximum possible charge on the inner capacitor? c....

Which of the following is true regarding the mechanisms by which energy balance is regulated? a....

Which of the following is true regarding the mechanisms by which energy balance is regulated? a. lower levels of ghrelin will increase satiety b. gastric distention is not a significant factor regulating satiation c. as fat stores increase, adipose tissue produces less leptin d. leptin plays a significant role in the process of short-term satiation

Consider two spherical shells with radii R1 < R2 with the inner shell having the potential...

Consider two spherical shells with radii R1 < R2 with the inner shell having the potential Φ(ϑ)=Φ1×cos^2(ϑ), ϑ being the azimuthal angle in spherical coordinates. The outer shell is metallic and uncharged (Q2 = 0). Calculate the potential Φ(r) on the entire space. Thanks a lot.

Which of the following statements is true concerning the electron configuration [Ar]4p2? A. This configuration is...

Which of the following statements is true concerning the electron configuration [Ar]4p2? A. This configuration is the ground-state electron configuration for a Ca atom. B. This configuration cannot be the ground-state electron configuration for a Ca atom because it violates Hund's rule. C. This configuration cannot be the ground-state electron configuration for a Ca atom because it violates the Aufbau principle. D. This configuration cannot be the ground-state electron configuration for a Ca atom because it violates the Pauli exclusion...