| Question Answer | What is the name of the model of the atom that reflects the unpredictable motion of the electron? electron cloud model | Aristotle believed that matter was? uniform throughout | The discrovy of the sixth quark was accomplished by? studying proton collisions |
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Which of the following methods would be most useful for describing the atom?
Because atoms are too small to be observed visually, constructing a model would be the most useful method to explain and describe them. You just studied 20 terms!
Which of the following models of the atom reflects the unpredictable motion of the electron?
| Question Answer | What is the name of the model of the atom that reflects the unpredictable motion of the electron? electron cloud model | Aristotle believed that matter was? uniform throughout | The discrovy of the sixth quark was accomplished by? studying proton collisions |
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Which nineteenth century English scientist offered proof that atoms existed?
| Which of the following methods would be most useful for describing atoms? Need a Hint? | D) negatron | What nineteenth-century English scientist offered proof that atoms existed? Need a Hint? | A) Aristotle | B) Democritus |
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Which of the following atomic particles is electrically neutral *?
The electrons have a negative electrical charge. An atom usually contains an equal number of positively charged protons and negatively charged electrons. This makes the atom itself electrically neutral. The electrons exist at different energy levels, called shells, around the nucleus.
What are the positively charged part of an atom called?
Protons are positively charged particles found within atomic nuclei.
Which of the following best describes the three main general groups?
The three main classes of elements are metals on the left side, metalloids on the staircase , and nonmetals on the right hand side.
What is the value of one proton?
A proton has a charge of +1 , or 1e, which is equal to 1.602 x 10^-19 coulombs, and a mass of 1.67 x 10^-27 kg. As you can see, the charge is denoted by the letter ‘e,’ which originated in 1874 by George Stoney. While small by our everyday standards, it’s 1,836 times larger than an electron.
What is the charge of the electron?
Electron charge, (symbol e), fundamental physical constant expressing the naturally occurring unit of electric charge, equal to 1.602176634 × 10 − 19 coulomb .
What is the majority of an atom?
Mass: The majority of an atoms’ mass comes from the protons and neutrons that make up its nucleus. Electrons are the least massive of an atom’s constituent particles, with a mass of 9.11 x 10 – 31 kg and a size too small to be measured by current techniques.
Who said atoms contain mostly empty space?
In 1911, a British scientist named Ernest Rutherford discovered that an atom is mostly empty space. He concluded that the positively charged particles are contained in a small central core called the nucleus.
Which is located outside the nucleus of an atom?
Unlike protons and neutrons, which are located inside the nucleus at the center of the atom, electrons are found outside the nucleus. ... It shows the electron as a particle orbiting the nucleus, similar to the way that planets orbit the sun.
Which particle’s determine s the identity of an element?
Explanation: The identity of the element is determined by the number of protons , which are positively charged, massive nuclear particles. The number of protons in a nucleus is given by Z , the atomic number.
What is the significance of valence electrons quizlet?
The electrons that occupy the outer most shell of an atom are called valence electrons. They are important because they determine how an atom will react . By writing an electron configuration, You’ll be able to see how many electrons occupy the highest energy level.
Why is iron’s atomic number 26?
The number of protons is the defining characteristic of an element, and this number also tells you how many electrons are present in a neutral atom. Therefore, iron — with an atomic number of 26 — has 26 protons and electrons . ... Iron has four stable isotopes, and each one has a different number of neutrons.
What is the rounded atomic mass?
The total number of protons and neutrons in an atom is called the mass number. You can find the mass number for any element. The mass number can be found by rounding the average atomic mass to the nearest whole number .
