百度试题 结果1 题目6 An atom of element Q contains 19 electrons, 19 protons and 20 neutrons.What is Q? B A calcium B potassium C strontium D yttrium 相关知识点: 试题来源: 解析 B 反馈 收藏
Which particle of an atom has the least mass? Which element has the highest atomic number? A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it? What is the smallest particle of an element?
A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it? What element has 53 protons and 74 neutrons? If an atom with a mass number of 202 has 122 neutrons, it is an atom of which element?
What is an atom that has more protons than electrons? Atoms: Atoms are the purest form of matter. They consist of protons, neutrons, and electrons. The periodic table lists all of the different types of atoms that are known to exist and are known as elements. ...
aThe element X has three isotopes: X-221, X-220, and X-218, with masses 220.9, 220.0, and 218.1 amu. The relative abundances of these three isotopes are 74.22%, 12.78%, and 13.00%, respectively. Calculate the atomic mass of element X. 元素x有三同位素: X-221, X-220和X-218,与大量...
ICSEC - Grade 09 - CHEMISTRY - Atomic Structure And Chemical Bonding - Q23
What element has a ground state electron configuration that contains five unpaired 5d electrons? An element in its ground state has the following electron configuration: (Ne)3s23p2. What is this element? An elemen...
Each12C atom has six protons and six neutrons in its nucleus, adding up to an atomic mass of 12 AMU.Electronshave a low mass, so they are assumed to have a negligible effect. Consequently, the nucleus accounts for almost the entire mass of the atom of any element, which means that a ...
Add one proton, one neutron, and one electron and you get an atom of beryllium (symbol Be).See how it works? In all atoms, the number of protons and the number of electrons is always the same. So nitrogen has 7 protons and 7 electrons, calcium has 20 protons and 20 electrons, and...
matter. Each element is defined by the number of protons in its nucleus. The chemical elements are organized on theperiodic table of the elements. Each element has an atomic number and a symbol. The symbol may be based on the Latin name of the element and not be related to the English ...