Volume occupied by electrons Nucleus containing protons and neutrons- -10-4 Å- -1-5 Å– A Figure 2.10 The structure of the atom. A cloud of rapidly moving electrons occupies most of the volume of the atom. The nucleus occupies a tiny region at the center of the atom and is composed of the protons and neutrons. The nucleus contains virtually all the mass of the atom.

Q: Rutherford’s gold foil experiment consisted of firing positively charged alpha particles at a thin…

A: Rutherford alpha particle experiment. He observed that when alpha particles are passed through the…

Q: The nucleus, the massive center of an atom, contains which two particles?

A: Nucleus is the massive part of any atoms . It contains mostly all the mass any element. Nucleus was…

Q: Check all the correct statements. Note: Push yourself to understand why these statements are true or…

A:

Q: 8. Identify for an atom of 32s : element name: Z, atomic number = A, mass number = number of…

A:

Q: Differentiate between the mass number and the atomic number?

A: Mass number (A)- the number of protons(p) and neutrons(n) present in an atom of element called as…

Q: Can neutrons in the nucleus of a particular element do vary ?

A: Atom consist an nucleus having positive charge. Nucleus consist proton and neutron.

Q: Given the only naturally occurring isotope of aluminum is Al-27, determine its mass from the…

A: Isotopes of an element are the ones which have the same atomic number but different mass number.…

Q: What composes the nucleus of an atom?

A: There are three basic particles present in an atom.  These are : electron (represented by e), proton…

Q: What is the symbol for an atom of Cd that has 13 extra neutrons and what is that called ?

A: Cd is present alongwith Zn and Hg i.e. it is kept in d-block although it is not a typical d-block…

Q: What is an atom composed of?

A: an atom composed of :

Q: onsider two isotopes.  write the nuclear symbol for both isotopes how do they differe from each…

A: The word isotope consists of two words, iso means same and topo means position. It is defined as the…

Q: What element has a symbol of K?

A: An atom is the basic and fundamental unit of matter. An atom consists of electron and the nucleus in…

Q: In atoms, protons and neutrons are found (a) only in the nucleus. (b) outside the nucleus. (c)…

A: An atom is composed of three main sub atomic particles; electrons, protons and neutrons. Out of…

Q: Which of the following characterizes an alpha ray? Choose all that apply. carries a positive charge…

A: Alpha particals are same as helium containing two proton and two neutron.

Q: List the components of an atom

A: An atom is the smallest particle of matter that participates in a chemical reaction other than…

Q: 6) the nucleus is a very small region that contains 99.99% off the atoms mass? true or false

A:

Q: What three things does the atomic mass (average atomic mass) depend on?

A: If you carry a watermelon in a plastic polybag, then in order to calculate the total mass, mass of a…

Q: What letters are used to designate atomic number and mass number in isotopic notation of atoms?

A: There are different symbols are used to exhibit atomic Number and mass number of atoms. Atomic…

Q: The last “missing” element from the first six periods waspromethium, which was finally discovered in…

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Q: What factors have led to changes in atomic mass since 1910?

A: Atomic Mass - It is basically the mass of an atom.

Q: What is the mass of each isotope?

A: Isotopes are atoms of same elements which have same atomic number but different mass number. In…

Q: What is the charge of the nucleus of element 89?

A: The number of protons corresponds to the charge of the nucleus since Neutrons have no net charge, it…

Q: For the particles of an atom, which two particles have the same mass?

A:

Q: The mass and charge (composition) of the B- particle indicate that it is identical to an electron. *…

A: We have to tell whether the given statement is true or false

Q: i) Ernest Rutherford discovered a. proton b. electron ...................by thin gold foil…

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Q: Consider a sample of antimony collected from a different solar system. The sample contained 45.8…

A:

Q: mass of electron

A: Electron is defined as the lightest stable subatomic particle known.

Q: What is a stable isotope of lithium? How many electrons does it have?

A:

Q: A- Determine the mass of nucleons and electron by atomic mass unit?

A: mass of 1  electron = 5.45e-4 amu, mass of proton = 1 amu and mass of neutron = 1.     Now, nucleons…

Q: An atom with 2 electrons, 2 protons and 4 neutrons has an atomic number of ...

A: Given -> Number of electrons = 2 Number of proton = 2 Number of neutron= 4

Q: Átom?

A: Step 1:The entire universe is composed of energy and matter. Anything around us that has holds mass…

Q: Describe the experiment that provided the basis for ourunderstanding of the nucleus.

A: Describe the experiment that provided the basis for our understanding of the nucleus.

Q: Which of the following is incorrectly matched? neutron : -1 atomic mass unit (amu) neutron : located…

A: A chemical element is made up of atoms, the smallest unit of ordinary matter. Atoms, whether neutral…

Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.