百度试题 结果1 题目10 An isotope of element Y has 19 protons and 20 neutrons in its nucleus. Which is the symbol for the ion of Y? B2039A YB19192039C YD1919 相关知识点: 试题来源: 解析 B 反馈 收藏
An atom consists of a nucleus, which contains protons and neutrons, surrounded by electrons. The number of protons determines the element of the atom, while the number of neutrons can vary. Electrons exist in energy levels or shells around the nucleus. 开学特惠 开通会员专享超值优惠 助力考试高...
a有 但是 是坏的 But has is bad[translate] a也就是说铁元素原子核中的中子与质子要比其它所有元素原子核中的中子与质子靠近得更紧密,其中子与质子间的强相互作用力也最大,因而当其向同一个方向排列时,其也具有最大的磁场。 In other words, in the hard element atomic nucleus neutron and the proton ...
aIndividuals receiving bilateral training showed a reduction in movement time of the impaired limb and increased upper limb functional ability compared to individuals receiving unilateral training. 接受双边训练的个体显示了对被削弱的肢体的运动时间的减少并且增加了上部肢体功能能力与接受单边的训练的个体比较。[...
The chemical reactivity of an element is largely determined by a. the number of protons in the nucleus of the atom. b. the number of neutrons in the nucleus of the atom. c. the number of electrons in the outer or Which of th...
A certain element has its outermost electron in a 3p subshell. It has valence +3 because it has three more electrons than a certain noble gas. Identify the number of electrons in the ground-state outer shell of atomic phosphorous. What is the order of the number of free electron...
The isotopes of a given element have the same chemical properties but slightly different physical properties. We now know that atomic number (the number of protons in the nucleus), not atomic mass number (the number of protons and neutrons), determines chemical behavior.Mendeleyev went further ...
Write the electron configuration for the Br- ion, which has thirty-six electrons.Take element Z = 24 from the periodic table. Ionize it 23 times so that there is only one electron left orbiting around the nucleus. What is the ground state energy of the elec...
aThen, Rutherford himself proposed the orbital model for the atom, in which there was a central nucleus populated by positively charged particles – protons – and negatively charge particles – electrons – moving around the nucleus 正在翻译,请等待...[translate]...
Which element is a noble gas with 18 protons in the nucleus?Noble gases are inert because they have completed outer electron shells. Which of these elements isn't a noble gas? a. Helium b. Argon c. Chlorine d. KryptonWhich element has the following noble gas core electron c...