How did they describe atoms in around 450BC?

Q: Potassium naturally consists of 93.10% K-39 and 6.9% K-41. Calculate the atomic mass for Potassium.

A: Given that, % abundance of K-39 = 93.10 % = 0.9310  % abundance of K-41= 6.9 % = 0.069  Then,

Q: m atom c

A: Atom is the small particle of matter and made up of three fundamental particles which are known as…

Q: 28. I A certain element consists of two stable isotopes. The first has an atomic mass of 137.9068…

A:

Q: State the main points of Dalton’s atomic theory using your own words. Which parts of Dalton’s theory…

A: Introduction: John Dalton, in the year 1808, put forward his atomic theory on the nature of matter.…

Q: Aluminum has 13 electrons, 13 protons and 14 neutrons a) What is its atomic mass? b) What is its…

A: The atomic number of aluminium is = 13 The number of protons in the aluminium is = 13 The number of…

Q: Selenium-80 is a naturally occurring isotope used in overthe-counter supplements.a. How many protons…

A: An atom is mainly composed of three sub-particles; electrons, protons and neutrons. These particles…

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: Q2. Which statement best summarizes the nuclear model of the atom that emerged from Rutherford’s…

A: In order to find out the arrangement of e- and protons in atoms, Rutherford conducted a series of…

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: Chemistry: Fundamentals and Principles Davidson presented by Macmillan Learning For each set of…

A: For a neutral atom, Atomic number = Number of protons = Number of electrons and Mass number = Number…

Q: Determine whether each of the following statements is trueor false. If false, correct the statement…

A: An atom is the “smallest unit in an element”, this was until the discovery of the sub-atomic…

Q: A natural sample of chromium, taken from the ground,will contain four isotopes: Cr-50, Cr-52, Cr-53,…

A: Chromium has four stable isotopes which are Cr-50, Cr-52, Cr-53, and Cr-54. Isotopes are the atoms…

Q: Describe the early Greeks' idea of the atom?

A:

Q: If an atom has 35 protons in the nucleus,how many electrons will it have orbiting the nucleus?

A: An atom contains three sub-atomic particles. These are protons, neutrons and electrons.

Q: There are three stable forms of neon: neon-20, neon-21, and neon-22. Which statement is true? O The…

A: The isotopes of the neon given are neon-20, neon-21 and neon-22.

Q: What was the Copernican revolution? O A. The discovery that the sun was not the center of the…

A: Copernican revolution is about the model of the solar system and was given by a polish astronomer.

Q: complete the following information. If necessary, use the periodic table. Nuclear symbol = ? Charge…

A: Answer :- Nuclear symbol :- Chemists generally used certain element using standard atomic notation ,…

Q: Potassium naturally consists of 93.10% K-39 and 6.90% K-41. K-39 has an atomic mass of 38.963707…

A:

Q: Suppose a new element is found on an extraterrestrial planet, element J. Element J consists of two…

A:

Q: 13. Which of the following are isotopes? a. P3- and Ar b. 1251 and 127| c. O and O2- d. Na* and K*…

A: b) 125I and 127I

Q: A naturally occurring sample of an element contains only two isotopes. The first isotope has a mass…

A: The atomic mass of an element is defined as the weighted average mass approximately equal to the…

Q: What is atom

A: The atom is the smallest unit of matter that is composed of three sub-atomic particles: the proton,…

Q: A 0.383 g sample of an element contains 1.943 × 10 21  atoms. What is the element symbol

A: Given, amount of sample =0.383 gnumber of atoms of the sample =1.943×1021 atomswe are asked to…

Q: Calculate the relative atomic mass

A: The relative atomic mass of an element is defined as an average value for the isotopes of the…

Q: Where are particles with virtually no mass found in the atom? A. The electron cloud B. Inside the…

A: Ans  A)  The electron cloud .

Q: Fill in the blanks:a. Isotopes of an element differ in mass because the atomshave a different number…

A: The complete statements have to be provided.

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: The existence of isotopes violates one of the original ideas of Dalton’s atomic theory. Which one?

A:

Q: Boron occurs naturally as 10B and 11B. Which isotope is most abundant? (Refer to the Periodic…

A: The isotopes can be described as the types of the species which have equivalent atomic number…

Q: A selection of the most prominent individuals mentioned in this topic is given below. Match Column A…

A: In one column , there is different names of Scientists.  On the other column, there is some of the…

Q: A naturally occurring sample of an element contains only two isotopes. The first isotope has a mass…

A:

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: Fill in the empty cells. Isotopic Symbol Element atomic Symbol number mass # of # of # of number…

A: Atom consist the mainly three sub atomic particles, that are electron, proton and neutron. Electron…

Q: Give a Characteristics of an Atomic?

A: Solution-   An atom has three subatomic particles The nucleus has a well-charged atomic center and…

Q: proposed

A: Democritus theory is Ancient theory, He say about that matter consists of atom means smallest…

Q: What did the scientists who are credited with discovering the proton and neutron have in common?

A: Solution Ernest Rutherford determined that his scintillation detectors detected gas nuclei once a…

Q: What is the abundance of beryllium-10 ?

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

Q: QUESTION6 Rutherford's alpha-particle bombardment of gold foil helped develop our current model of…

A: Answer 6: In the Rutherford's alpha -particle experiment it was observed that:i)Most of the alpha…

Q: An element has two naturally occurring isotopes. One has an abundance of 51.839% and an isotopic…

A:

Q: How is the atomic mass unit, amu, defined?

A: 1 a.m.u. = 1.66 × 10-24 g

Q: Element: Lead Name of isotope Number of Number of Abundance Abunda Protons Neutrons Mass (amu) (%)…

A: We are given isotopes of lead(Pb), and we have to find the number of protons, neutrons and %…

Q: What is the relationship between an isotope’s abundance in nature and an element’s atomic mass…

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

Q: This homework is going to center around a completely made up element - Maplenium. This metal has a…

A: Please find the solution below:

Q: Which statements are inconsistent with Rutherford’s nucleartheory as it was originally stated?…

A: According to  Rutherford’s, the atom has a tiny, massive core and it is called as nucleus. The…

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…

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.