If atom X has an atomic number of 74, it would have _____.   Select one: a. 74 protons and roughly 74 electrons b. 74 protons and neutrons c. 37 electrons d. 37 protons and 37 neutrons

Q: The Greeks proposed that matter consisted of four fundamental substances: Select one: O a. atoms,…

A: The Greeks were the first ones who tried to explain why chemical changes occur. They proposed that…

Q: How are electrons and protons similar? How are they different?

A:

Q: 36. Which statement about protons is false?(a) Protons have about the same mass as neutrons.(b)…

A: An atom is made of three particles namely, protons, neutrons, and electrons. The protons and…

Q: I have to explain why this question is incorrect as I put the wrong answer for this and explain why…

A: Given , Heavier isotope has = 42 neutrons Gi2+ ha  40 electrons

Q: What is an atom's mass number? number of protons plus number of neutrons O number of electrons O…

A: We have to predict correct option for mass number.

Q: What are the main ideas in Dalton’s atomic theory?

A: Dalton was a well-known experimentalist and his significant studies on behaviours and properties of…

Q: The isotope of an unknown element, , has a mass number of 78. The most stable ion of this isotope…

A: Given,  The mass number of an unknown element isotope is 78. The most stable ion of this isotope has…

Q: Which statement regarding the nucleus of an atom is correct? A. The nucleus contains protons and…

A: Nucleus of any atom consists of three particles : Proton  neutron electron

Q: Does the Aluminum (Al) ion gain or lose electrons? a Lose because it is easier for Aluminum (Al) to…

A: Al have 13 electron and 3 electron in it's valence shell. It is element of boron family. Noble gas…

Q: Periodic Table Matching - Part B Periodic Table Matching - Part C Argon (Ar.) A. Atomic mass is more…

A: Given, Elements from periodic table. We have to match the properties of each element with the given…

Q: + а. Bohr b. Dalton C. Rutherford d. Thomson 3. Which atomic model was the first to show a nucleus,…

A: 27) in the Given figure, the model of an atom was proposed by Thomson.

Q: John Dalton was an English scientist who lived from 1766 to 1844. Dalton's significant contributions…

A: Dalton put forward the theory of matter. It is the oldest theory that explains the nature of matter.…

Q: A sample of element X contains 90% X-35, 8.0% X-37, and 2.0% X-38 atoms. The average atomic mass…

A: The average mass of n isotopes can be calculated as: Average atomic mass = ∑i=1n  pimipi =…

Q: 7. 12.01 g of carbon has approximately 602,214,129,000,000,000,000,000 atoms. What is the…

A:

Q: What is the most massive part of an atom? A. Protons B. Nucleus C. Area outside the nucleus D.…

A: We know that an atom contains three subatomic particles - electrons , protons and neutrons.…

Q: How do you know that each element match up to their letter descriptions? I want a small explanation…

A: Names and Symbols of the ElementsEvery component has a name. A large number of these names are now…

Q: Explain how each scientist’s experiment contributed to the characterization of the atom (example:…

A: We have to explain each scientist’s experiment.

Q: 1. Determine the number of protons, neutrons and electrons F-20 , a radioactive isotope of fluorine.…

A: 1) The isotope given is F-20.

Q: (a) How many protons are found in one atom of selenium-80? protons (b) How many neutrons are found…

A:

Q: What is the charge on the electron, the proton, and the neutron, respectively? a.-1, +1, +1 b. -1,…

A: Write charge and mass of electron, proton and neutron ---

Q: The element cobalt (Co) has: O 27 protons, 27 neutrons, and 32 electrons. 27 protons, 32 neutrons,…

A: Mass no. Of an element is represent by 'A'. 'A' is the sum of Mass no. & Atomic no.

Q: Which pair of particles have the same number of electrons  Choice A: F-,Mg2+ Choice B: Ne,Ar…

A: An isoelectronic pair  is a group of ions that all have the same number of electrons.

Q: 1. Rubidium has two naturally occurring isotopes, from the following data calculate the value of X?…

A:

Q: Atoms with the same number of protons but with different electrical charges _____.

A: Electric Charge is two types.    Positive charge Cation and negative charge anions

Q: 24.1% of all isotopes of an element have a mass of 75.23 amu. 48.7% have a mass of 74.61 amu and…

A:

Q: 5. Which elements are halogen elements? A. Fluorine, Chlorine, Bromine B. Calcium, Strontium, Barium…

A: We would use periodic table properties to answer these questions.    Note : As you have uploaded…

Q: Why is it easier to use helium ions rather than neutral helium atoms in such a microscope? (a)…

A: The He-ion microscope is the one that uses a beam of He-ion for its purpose. The use of this…

Q: 9. What observations in the gold foil experiment made Rutherford conclude that atoms are mostly…

A: 9. The answer is option no. (B) Most alpha particles passed through the gold foil undeflected. 10.…

Q: Q5/ A- Atoms are spherical and so when silver atoms pack together to form silver metal, they cannot…

A: 5- (A)

Q: 25. Which determines the speed of a molecule? * a. Its kinetic energy b. The amount of the molecules…

A: Multiple choice questions : 25-28

Q: 13. 9.62 g of an element contains 0.240 mol. Identify the element. А. В В. Не С. Са D. Zr E. Both Ca…

A: Weight of an element = 9.62 g No. of moles = 0.240 mol

Q: In any neutral Adam there are equal numbers of? A. Neutrons and electrons B. Protons and neutrons…

A: Neutral atom are those having not any charge. They are wholely neutral

Q: The nucleus of an atom accounts for most of the size and mass of the atom. O very little of the size…

A: According to Dalton's atomic theory, compound is formed by combining elements and it's also based on…

Q: Here is a list of statements. Put a check mark for the accurate ones and the necessary corrections…

A: Matters are the particles which consists mass and volume. Matter is not able to be seen by naked…

Q: 9. What does the atomic number on the periodic table indicate about an atom of that element? A the…

A: Option A will be correct.

Q: Verdana 16 B IUA CO O E E 5 LLI4 I 3IC 2. A Think About It Each of the atomic models shown…

A:

Q: 11. What was Rutherford's contribution to the atomic model? A. Electrons are not bound to the…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: what is the A, Z, E, CHARGE, MASS, # OF NUETRONS, PROTONS AND ELECTRONS OF POTASSIUM -40

A: Mass number (A) = number of protons + number of neutrons Atomic number (Z) = number of protons. E =…

Q: Which pair correctly matches an element to its atomic number? O a) 9.012 - Be O b) 12.01 - C c)…

A: The atomic number of an element is equal to the total number of protons in the nucleus of the…

Q: why Rutherford's model of an atom was considered to be unstable?

A: Rutherford’s experiment:Rutherford suggested that there is something at the center of the metal…

Q: When was the first theory about the character of the atom developed? O a. some 100 years ago O b.…

A: Atomic theory is a scientific theory of the nature of matter, which states that matter is composed…

Q: 6. The atomic mass of an element is found as the decimal number on the periodic table. For example,…

A: Here we using avarage atomic mass of vanadium and abundance of vanadium in nature.

Q: 1. Determine the number of protons, neutrons and electrons F-20 , a radioactive isotope of fluorine…

A: 1) The isotope given is F-20.

Q: 19. Draw an atom (not actual size). Label your drawing as completely as possible.

A: An atom is the fundamental unit that forms an element. They are very small and contains a nucleus at…

Q: A helium atom consists of two protons, two electrons and Iwo neutrons. In the helium atom, the…

A:

Q: 70 Zn 30

A: The atomic number of an atom is the number of protons present in the atom. For a neutral atom, the…

Q: WILIT al 10 20.180 6. How many protons does this element have? 7. How many electrons does this…

A: Introduction- Atomic number (Z) of an element is the number of protons in an element. Atomic mass…

Q: Which part of John Dalton’s theory was disproved by J.J. Thomson’s cathode-ray tube experiments?…

A: To find: Which part of John Dalton’s theory was disproved by J.J. Thomson’s cathode-ray tube…

Atomic Structure

The basic structure of an atom is defined as the component-level of atomic structure of an atom. Precisely speaking an atom consists of three major subatomic particles which are protons, neutrons, and electrons. Many theories have been stated for explaining the structure of an atom.

Shape of the D Orbital

Shapes of orbitals are an approximate representation of boundaries in space for finding electrons occupied in that respective orbital. D orbitals are known to have a clover leaf shape or dumbbell inside where electrons can be found.