中国公民李某2020年总计取得工资收入105000 元,专项扣除20000元。李某夫妇有个在上小学的孩子,子女教育专项附加扣除由李某夫妇分别按扣除标准的50%扣除,假设无其他附加扣除项目,下列计算李某2020年个人综合所得的应纳税所得额的算式中,正确的是( )。
(i) Complete the diagram below to show the electronic structure of an atom of magnesium.2 electrons in outer shell8 electrons in middle shell Mg[2](ii) An isotope of magnesium has a nucleon number (mass number) of 26.Deduce the number of neutrons in one atom of this isotope of ...
How many electrons in an atom could have a set of quantum numbers with n = 3? Pauli Exclusion Principle: According to Pauli's exclusion principle, no two electrons of the same atom can have all four quantum numbers equal to each other. On the other hand, multiple electrons...
The hydroxide ion, OH−, has a total of 9 protons.How many neutrons and electrons are there in this ion?题目难度：容易 考点分析：求neutrons，electrons和protons之间的关系 题目分析：hydroxide ion有9个protons，带负一价电，所以electrons数量比protons多一个，为10个，立马就把答案B给选出来了。O有8...
Which statements help to explain this trend from sodium to aluminium? 1 The charge on the metal ion increases. 2 There are more delocalised electrons per metal ion. 3 The radius of the metal ion decreases. 36 Under room conditions, 600 3 cm of a gas, X, has a mass of 0.700 g. ...
Note: Atomic mass is a dimensionless quantity. Since the atomic number of sodium is 11, it has got 1 electron in the valence shell. Therefore, the valency of sodium is 1. The number of protons is equal to the number of electrons in sodium. But when s...
Describe the structure of an atom.An atom consists of a nucleus, which contains protons and neutrons, surrounded by electrons. Protons have a positive charge, neutrons have no charge, and electrons have a negative charge. The number of protons determines
How many electrons in a S atom has n = 2? a. 4. b. 6. c. 8. d. 0. How many electrons in an atom could possibly have n = 3? a. 10. b. 0. c. 18. d. 14. What is the maximum number of electrons in an atom that can have the following quantum numbers: n=3...
Which of these ions has/have the same number of electrons as a neutral atom of argon? a. {eq}S^{2-} {/eq} b. {eq}O_2^- {/eq} c. {eq}Ca^{2+} {/eq}Atoms and Ions:Neutral atoms have equal numbers of protons (which are positively...
For example, sodium has an atomic number of 11, meaning the innermost shell has two electrons; the next shell has eight, and the outermost valence shell has one. Sodium could have a complete outermost shell if it donated its extra electron. Chlorine, on the other hand, has an atomic numbe...