2015年11月13日 · Here's what I got. Aluminium-27 is an isotope of aluminium characterized by the fact that is has a mass number equal to 27. Now, an atom's mass number tells you the total number of protons and of neutrons that atom has in its nucleus. Since you're dealing with an isotope of aluminium, it follows that this atom must have the exact same number of protons in its nucleus. The number of protons an ...

2015年10月1日 · Here's what I got. So, you know that the first nuclear equation has aluminium-27 react with a neutron. A neutron has no charge and an atomic mass equal to one, so you can write ""_13^27"Al" + ""_0^1"n" -> ""_13^28"Al" The resulting aluminium-28 isotope will then decay via alpha decay. When isotopes undergo alpah decay, their nucleus emits an alpha particle, which is essentially the nucleus of ...

2016年11月26日 · It necessarily has 14 "neutrons". The mass of a given atom depends on (i) the number of nuclear protons (and this number determines the identity of the element, because it gives Z by definition); and (ii) the number of neutrons, massive particles of neutral charge. Neutrons and protons are the massive fundamental particles, which determine the mass of a given isotope. And thus for ""^27Al, we ...

2016年1月25日 · The atomic number, Z, of aluminum metal is 13. What is 13-3? Clearly, there are 10 electrons associated with a single Al^(3+) ion. We don't need any chemistry to make this determination. The atomic number specifies the number of positively charged particles in the atomic nucleus. The aluminum nucleus contains 13 protons, 13 fundamental, positively charged particles; this is what identifies the ...

2017年1月18日 · The element with atomic number 13 is aluminum. The atomic number gives us the number of protons in an atom of aluminum. A neutral Al atom also has 13 electrons. In its ground state, a neutral aluminum atom will have the following electron configuration: #"1s"^2"2s"^2"2p"^6"3s"^2"3p"^1"#

2014年12月17日 · The atomic number of an element is the number of protons in the nuclei of its atoms. In a neutral atom, the number of electrons is the same as the number of protons. The atomic number of aluminum is 13. A neutral atom of aluminum has 13 protons and 13 electrons. The ground state electron configuration for aluminum is "1s"^2"2s"^2"2p"^6"3s"^2"3p ...

2016年8月4日 · "Al"^(3+): 1s^2 2s^2 2p^6 Your starting point here will be the electron configuration of a neutral aluminium atom, "Al". Aluminium is located in period 3, group 13, and has an atomic number equal to 13. This tells you that the electron configuration of a neutral aluminium atom must account for a total of 13 electrons. The electron configuration of the neutral atom looks like this "Al: " 1s^2 ...

2018年5月21日 · 13 Atomic number tells you the number of protons in an atom. Atoms are have no charge; they are electrically neutral. Therefore, the number of protons equals the number of electrons as protons have a +1 charge and electrons have a -1 charge.

2015年10月30日 · The molar mass of aluminum is 26.982 g/mol. The molar mass of an element is the mass in grams of 1 mole of the element. It is determined by taking the atomic weight of the element on the periodic table, and writing it as g/mol.

2017年5月23日 · Uranium-238. In order to find the identity of the nuclide, you need to know two things the atomic number of the atom the mass number of the atom The atomic number, Z, is given by the number of protons present inside the nucleus, so you can say that your nuclide has an atomic number equal to 92. The mass number, A, is given by the number of protons and neutrons present inside the nucleus. color ...