Description : Atoms of the same element having same atomic number and different mass number are known as?
Last Answer : Isotopes
Description : Pick out the correct statement. (A) Loss of electrons from neutral atoms produces negative ions (B) The radius of nucleus & atomic size are of the order of 10 -12 cm & 10 - 8 cm respectively (C) Gain of electrons by neutral atoms form cations
Last Answer : (B) The radius of nucleus & atomic size are of the order of 10 -12 cm & 10 - 8 cm respectivel
Description : What atoms of the same element but with various atomic weights?
Last Answer : These are the isotopes.
Description : Dentification: Atoms of the same element but with various atomic weight?
Last Answer : Isotope
Description : The sum of the mass numbers of the atoms in a molecule equals the ______, which is measured in units called _______. a. Atomic Number; Milligrams b. Mass Weight; Micrograms c. Chemical Weight; Moles d. Molecular Weight; Daltons
Last Answer : d. Molecular Weight; Daltons
Description : All isotopes of the same element have ______ (1) different atomic numbers and different atomic mass (2) different atomic numbers and the same atomic mass (3) the same atomic number but different atomic masses (4) the same atomic number and the atomic mass
Last Answer : the same atomic number but different atomic masses
Description : If an atomic number of an element is 6 and its mass is 14 how many neutrons are contained in the nucleus?
Last Answer : jjjj
Description : An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is– (1) 17 (2) 19 (3) 36 (4) 53
Last Answer : (2) 19 Explanation: Mass Number = number of protons (atomic number) + nu.sriber of neutrons. So as per the question, 36= number of neutrons + 17. Number of neutrons= 36 -17= 19
Description : The new nucleus formed after β-decay of a radioactive element has (A) Less atomic number (B) Less atomic weight (C) More atomic number (D) More atomic weight
Last Answer : (A) Less atomic number
Description : How many neutrons are present in the nucleus of an element with an atomic weight of 119 and an atomic number of 50?
Last Answer : ANSWER: 69
Description : An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is (1) 17 (2) 19 (3) 36 (4) 53
Last Answer : 19
Description : Which one is different for the neutral atoms of the isotopes of an element? (A) Atomic weights (B) Atomic numbers (C) Number of protons (D) Number of electrons
Last Answer : (A) Atomic weights
Description : Which one of the following best defines the word allotropes ? A Different structural forms of an element B A pair of substances that differ by H+ C Elements that possess properties intermediate between ... a specific number of neutrons E The different phases (solid, liquid or gas) of a substance
Last Answer : A Different structural forms of an element
Description : `3.011 xx 10^(22)` atoms of an element weight 1.15 g. The atomic mass of the element is :-
Last Answer : `3.011 xx 10^(22)` atoms of an element weight 1.15 g. The atomic mass of the element is :- A. 10 amu B. 2.3 amu C. 35.5 amu D. 23 amu
Description : Atoms of different elements have - (1) same atomic number and same electronic configuration (2) different atomic number and same eletronic configuration (3) different atomic number and different number of valence electrons (4) same number of electrons and neutrons
Last Answer : (3) different atomic number and different number of valence electrons Explanation: Each element's atoms have a different number of protons, neutrons, and electrons, which is why they have different ... Their reactivity also varies because of the number and activeness of the electrons in the atom.
Description : The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in?
Last Answer : 12 moles of KMn0O4
Description : When the difference between mass number and atomic number of atoms of two or more elements are same, the atoms are termed as (A) Isomers (B) Isotopes (C) Isobars (D) Isotones
Last Answer : (D) Isotones
Description : Atoms of different elements have (1) same atomic number and same electronic configuration (2) different atomic number and same eletronic configu-ration (3) different atomic number and different number of valence electrons (4) same number of electrons and neutrons
Last Answer : different atomic number and different number of valence electrons
Description : (3) the number of electrons orbiting around the nucleus Explanation: The chemical behavior of an atom is determined by the number of electrons on its outer shell. As for the chemical bonding properties of ... , and in what ratio atoms will bond to form the 20,000,000 different substances on Earth.
Last Answer : Methyl phenyl ether can be obtained by reacting - (1) phenolate ions and methyl iodide (2) methoxide ions and bromobenzene (3) methanol and phenol (4) bromobenzene and methyl bromide
Description : What is an atom that has the same number of protons as other atoms of the same element but different number of nutrons?
Last Answer : Feel Free to Answer
Description : What is A chemical equation where the number of atoms of each element are the same on both sides coefficients are often needed to balance a chemical equation?
Last Answer : Need answer
Description : All atoms of a given element have exactly the same number of which type of subatomic particle?
Last Answer : Protons A+
Description : It is important to balance the chemical equations to satisfy the law of conservation of mass. Which of the following statements of the law is incorrect? (a) The total mass of the elements present in ... the reaction (d) Mass can neither be created nor can it be destroyed in a chemical Reaction.
Last Answer : Answer : (c) The chemical composition of the reactants is the same before and after the reaction
Description : Two atoms of the same element will have the same number of protons. If they have a different number of neutrons, what are they called?
Last Answer : ANSWER: ISOTOPES
Description : What does the atomic number tell you about what is inside the nucleus of an atom?
Last Answer : The atomic number is equal to the number of protons.
Description : Choose the incorrect statement from the following: (a) The nuclear becomes weak if the nucleus contains too many protons compared to the number of neutrons (b) The nuclear force becomes weak if the ... (d) The nuclear force becomes very strong if the nucleus contains a large number of nucleons.
Last Answer : Ans:(d)
Description : The mass number of a nucleus is (a) Always less than its atomic number (b) The sum of the number of protons and neutrons present in the nucleus (c) Always more than the atomic weight (d) A fraction
Last Answer : Ans:(b)
Description : The mass number of a nucleus is - (1) always less than its atomic number (2) the sum of the number of protons and neutrons present in the nucleus (3) always more than the atomic weight (4) a fraction
Last Answer : (2) the sum of the number of protons and neutrons present in the nucleus
Description : The mass number of a nucleus is – (1) always less than its atomic number (2) always more than its atomic number (3) always equal to its atomic number (4) sometimes more - and somtimes equal to its atomic number
Last Answer : (4) sometimes more - and somtimes equal to its atomic number Explanation: Mass number = protons or mass of electron (atomic number) + neutrons. So it is mostly greater than the atomic number. At best, it can be equal to the atomic number.
Description : The emission of an a-particle causes the resultant nucleus to have (A) More atomic weight and less atomic number (B) Less atomic weight and less atomic number (C) Less atomic weight and more atomic number (D) None of these
Last Answer : (A) More atomic weight and less atomic number
Description : When an atom undergoes beta decay, the atomic number of the nucleus: w) is unchanged x) increases by one y) decreases by one z) none of the above
Last Answer : ANSWER: X -- INCREASES BY ONE
Description : The atomic number of a nucleus will increase by 1 if which of the following is emitted by the nucleus? w) an alpha particle x) a positron y) a beta particle z) a gamma ray
Last Answer : ANSWER: Y -- BETA PARTICLE
Description : The mass number of a nucleus is (1) always less than its atomic number (2) always more than its atomic number (3) always equal to its atomic number (4) sometimes more and somtimes equal to its atomic number
Last Answer : sometimes more and somtimes equal to its atomic number
Description : The atomic number of carbon is 6 and its atomic mass is 12. How many are there protons in the nucleus of carbon ? (1) 6 (2) 12 (3) 18 (4) Zero
Last Answer : 6
Description : In nuclear fission reactions, what causes the atom’s nucleus to become unstable?
Last Answer : the absorption of a free-moving neutron by the atom's nucleus
Description : The carbon atoms of pyrimidine nucleus are provided by (A) Glycine and aspartate (B) CO2 and aspartate (C) CO2 and glutamate (D) CO2 and glutamine
Last Answer : Answer : B
Description : The nitrogen atoms of pyrimidine nucleus are provided by (A) Glutamate (B) Glutamate and aspartate (C) Glutamine (D) Glutamine and aspartate
Last Answer : Answer : D
Description : Rutherford's scattering experiment proved the presence of – (1) atoms in all matter (2) electrons in atoms (3) neutrons in atoms (4) nucleus in atoms
Last Answer : (4) nucleus in atoms Explanation: On the basis of his experiment, Rutherford put forward the model of an atom, which had the following features: There is a positively charged centre in an atom called the nucleus.
Description : Rutherford’s scattering experiment proved the presence of (1) atoms in all matter (2) electrons in atoms (3) neutrons in atoms (4) nucleus in atoms
Last Answer : nucleus in atoms
Description : What is the number of atoms in 1 gram of atomic oxygen ?
Last Answer : 1 gram-atom Number of atoms in oxygen = 6.023 x 1023
Last Answer : The number of protons and the number of atoms of the atom of matter are equal to each other.
Description : Number of atoms of He in 100 amu of He is : (Atomic mass of He is 4) :-
Last Answer : Number of atoms of He in 100 amu of He is : (Atomic mass of He is 4) :- A. 25 B. 100 C. 50 D. `100 xx 6 xx 10^(-23)`
Description : Silver (atomic weight `108 g mol^(-1))` has a density of `10.5 g cm^(-3)`. The number of silver atoms on a surfaces of area `10^(-12) m^(2)` can be ex
Last Answer : Silver (atomic weight `108 g mol^(-1))` has a density of `10.5 g cm^(-3)`. The number of silver atoms on a ... `Y xx 10^(-x)`, The value of `x` is .
Description : Atomic mass is an atoms number of what?
Last Answer : it depends because isotopes have different nucleon numbers but their atomic number stays the same.
Description : The isotope atoms differ in - (1) number of neutrons (2) atomic number (3) number of electrons (4) atomic weight
Last Answer : (1) number of neutrons Explanation: Important to note that isotope atoms have same atomic number.
Description : What is the number of atoms constituting a molecule known as - (1) Atomic number (2) Isotopes (3) Atomic mass (4) Atomicity
Last Answer : (4) Atomicity Explanation: Atomicity is the total number of atoms present in one molecule of an element.
Description : Estimate the number of atoms comprising a silicon chip that is 0.2 millimeters by 0.2 millimeters by 0.1 millimeters, given that the density of silicon is 2.34 grams per cubic centimeter, the number of atoms in a gram-weight is approximately 6 x 1023 atoms, and the atomic weight of silicon is 28:
Last Answer : ANSWER: 2 x 1017
Description : An element with atomic 25 lies in group 7, then the atomic number of element which also lies in the same group is
Last Answer : An element with atomic 25 lies in group 7, then the atomic number of element which also lies in the same group is (A) 75 (B) 42 (C) 50 (D) 80