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
Elements are chemically the simplest substances and hence cannot be broken down using chemical reactions. Elements can only be changed into other elements using nuclear methods. Although an element’satomsmust all have the same number of protons, they can have different numbers of neutrons and hence...
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
Thefluorineelement is a chemical species that has a total of nine protons and ten neutrons in its nucleus.Protonsare positively charged entities whileneutronsare neutrally charged entities; both of which are condensed together in the center of the atom to form a nucleus. Theatomic massis the mas...
For example, the mass number of a carbon atom with 6 protons and 6 neutrons in its nucleus is 12. Isotopes Although all atoms of an element have the same number of protons in their nuclei, they may not all have the same number of neutrons. Atoms of an element with the same mass ...
this element consists of 2 electron shells (electron path). In the first electron shell, there are two electrons. The remaining 8 electrons are filled in the last electron shells. The second electron shell is completely filled. The protons and neutrons are found in the nucleus of the neon at...
that produces the huge amounts of energy radiated by the Sun and most other stars is the fusion of the lightest element, hydrogen, its nucleus having a single proton, into helium, the second lightest and second most abundant, with a nucleus consisting of two protons and two neutrons. In...
What element has 81 protons? What element has 26 protons? What chemical element has 4 protons? Which element has 27 protons? Which element has 3 protons? What element has 6 protons, 8 neutrons, and six electrons? What element has 4 protons 5 neutrons and 2 electrons? Which element has 16...
An element is a type of atom, and atoms typically have three components: positive protons, neutral neutrons, and negative electrons. What is the element definition in chemistry? An element is a substance made up of only one type of atom, all with the same number of protons. Gold offers a...
ICSEC - Grade 09 - CHEMISTRY - Atomic Structure And Chemical Bonding - Q23