Which of the following statements is TRUE, and why? A. Anions are usually larger than their corresponding atoms.  B. A neutral atom contains the same number of protons and neutrons. C. Protons and electrons contribute equally to the mass of the atom.

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: Which statement about electrons is true?(a) Electrons attract one another.(b) Electrons are repelled…

A: Molecules are composed of tiny particles called atoms. Atoms are composed of sub-atomic particles…

Q: ? 1. The mass on the periodic table. a. Atom 2. Region surrounding the nucleus where electrons are…

A: Solution of your question is given below :  Mass number is the mass on the periodic table .  Mass…

Q: How and by whom was the electron discovered? What basic properties of the electron were reported…

A: Models for electrons- J.Thomson in 1897 discovered electron with the help of cathode ray tube…

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: What are the components of an atom? How are they different?

A: The components of an atom and how are they different have to be explained below.

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: 7) Summarize Dalton’s, Rutherford's and J.J. Thompson's atom models on your own words. You can draw…

A: Dalton’s atomic theory proposed that all matter was composed of atoms, indivisible and…

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: Go Figure What is the charge on the particles that form the beam? Will they beattracted to or…

A: Basic unit of matter is atom. Study of atom was done by many scientists. Each scientist made some…

Q: Are electrons, protons, or neutrons the smallest particles? If not, what are?

A: We need to determine wheather  electron, proton or neutron are the smallest particle or not.

Q: 1. How are electrons arranged in atoms? In particular, what are the possible positions and what are…

A: Electron configuration is referred to as the distribution of electrons of an atom or a molecule, in…

Q: a. How many protons does this element have? b. How many neutrons does this element have? c. How many…

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

Q: An element has nine protons and 10 neutrons in the neutral atom. (a) How many electrons are present…

A: Given: Number of protons= 9 Number of neutrons = 10 To find: The number of electrons Atomic number…

Q: What most likely explains why the chemical symbol for calcium is? A. The symbol was already used for…

A: Calcium is discovered by Humphry Davy in 1808. It belongs to group 2 of the periodic table with an…

Q: In dating geological samples, scientist compare the ration rubidium-87 to strontium-87. Give the…

A: The atomic number is the number of protons in the nucleus of an atom. In an electrically neutral…

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

A:

Q: Part B Complete the sentences to explain your answers. Reset Help particles According to…

A: Given : Some fill in the blanks regarding Rutherford model of atom. To find : Fill in the blanks.…

Q: a. Explain how atoms of different elements differ from one another.b. Explain how atoms of different…

A: a).

Q: 1) a. Define mass number of an atom with examples. b.what is nucleus and electron of an atom?

A: Mass number is  the sum of the numbers of protons and neutrons present in the nucleus of an atom.

Q: Directions: Use the clues to fill in the words. Words can go across or down. Letters are shared when…

A: ACROSS  2. Nucleus 5. Gold  6. Rutherford

Q: match it's meaning

A: A . NOBEL GASES--------3 CONTAIN ELEMENTS IN ALL STATE OF MATTER  AT ROOM TEMERATURE C.…

Q: According to Dalton's Atomic Theory: I. Chemical compounds are formed when atoms of different…

A:

Q: ACROSS 2. Rutherford discovered that electrons orbit this atomic structure 5. Rutherford used…

A: Rutherford model was proposed by Ernest Rutherford in 1911. And cathode ray experience was done by…

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: postulate in the atomic theory did the discovery of isotopes contradict

A: The postulates of atomic theory are shown below: Matter is made up of small indivisible particle is…

Q: A hypothetical element, X, has two isotopes: 47X with an isotopic mass of 47.621 amu and 51X with an…

A: The atomic mass of the element can be calculated as,

Q: Rutherford's gold foil experiment determined that A) neutrons are in the nucleus. B) electrons have…

A: Rutherford bombarded the alpha particles on the very small sheet of gold. He observed that most of…

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: 1. Periodic table and electron configurationa) How many protons, electrons and Neutrons does the…

A: Hey, since there are multiple sub-parts posted, we will answer first three sub-parts. If you want…

Q: What basic properties of the electron were reported with its discovery?

A: The electron was discovered by an English physicist J.J.Thomson. J.J.Thomsom performed a cathode-ray…

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: Which scientist developed a model that is still used today to show the number of electrons in each…

A: Bohr model explains an atom as a small and positively charged nucleus surrounded by electrons. These…

Q: Which pair of particles has the same number of electrons?

A: Total electrons in a cation = atomic number - total positive charge  Total electrons in an anion =…

Q: Match the discovery/ideas/experiment to the contributor Found evidence that the atom is mostly empty…

A: We are given ideas/experiments/discoveries related to atomic structure and we have to identify the…

Q: Which information did Millikan contribute to the understanding of electrons?   A:He determined that…

A: Millikan's Oil Drop experiment - The oil drop experiment was performed by Robert A. Millikan and in…

Q: After studylng the chemical reactions of many compounds made of carbon, August discovers a chemical…

A: According to the question, we need to determine the missing words in the following phase.

Q: Since there are many more Carbon-12 isotopes found in nature, the mass of Carbon-12 should carry the…

A:

Q: 1. Which scientist discovered the quantized nature of electrons? а. Bohr d. Planck b. Dalton e.…

A: Electron has quantized nature.

Q: Assume you have a pure sample of chemical element. Based on the characteristics below, what…

A:

Q: Why Rutherford’s model could not explain the stability of an atom?

A: Models for electrons- J.Thomson in 1897 discovered electron with the help of cathode ray tube…

Q: d. A sample of potassium atoms is made up of 54% 39K and 46% 41K. Use this information to find the…

A:

Q: 2. An element that has 9 orbitals 5 fully filled, 2 single electrons and 1 empty orbital (a) What is…

A: f) Mg is a metal and can easily lose two electrons. It have properties similar to group 2 elements…

Q: subatomic particle with a1+ charge

A: In an atom three fundamental particles are present. Positively charged particle proton and neutral…

Q: According to the bohr model, an atom with 7 electrons has how many PAIRS of electrons? Type your…

A: An atom consists of protons, neutrons, and electrons sub atomic particles. Among those particles,…

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.