Which element is a metal in the fourth period? A. Calcium B. Germanium C. Bromine D. Krypton 相关知识点: 试题来源: 解析 A。解析:钙元素是第四周期的金属元素。锗元素是半导体,溴元素是非金属,氪元素是稀有气体。所以答案是 A。反馈 收藏 ...
Which of the following elements is a trace element in the body? a. H b. Mg c. C d. Zn e. Cs Which element works with sodium to regulate ATP? (a) chlorine (b) magnesium (c) manganese (d) potassium (e) calcium. An ele...
What characteristic distinguishes an element from a compound?Give the symbol for each of the following elements. (a) lead (b) sodium (c) oxygenClassify each element as an alkali metal, alkaline earth metal, halogen, or noble gas. a. sodium b...
After all,the Sun has many more atoms of any element, say iron, than does a meteorite specimen, but the ratios of iron to silicon in the two kinds of matter might be comparable. The compositional similarity is striking. The major difference is that Allende is depleted in the most volatile...
Which among the following is an element? ACalcium oxide BCommon salt COzone DWaterSubmit Which of the following hormone(s) is/are responsible for maintaining corpus luteum ? View Solution Which of the following elements is important to maintain structure of immunoglobulin View Solution Which of th...
To solve the question of which element is not present in plant tissues in large amounts, we can follow these steps:Step 1: Understand the Classification of Nutrients Plants require various nutrients for their growth, which are
The geometry is very similar to the older and proven MRK system, but the instruments and the device itself are lower profile and... View Device InformationGO-ON A syringe of GO-ON® contains: 2.5 ml of 1% sodium hyaluronate solution, sodium chloride, sodium monohydrogen phosphate, sodium...
Production manner of the calcium carbonate dispersing element and the milk constituent null which contains the said calcium carbonate dispersing elementPURPOSE: To improve dispersibility of calcium carbonate in food, especially in milky by adding water to calcium carbonate powder having specified physical ...
This robotic device from Quantum Surgical is said to allow planning, targeting, delivery and confirmation of tumour ablation. It can use image fusion and appears to use a similar guidance system... View Device InformationPH Papyrus This is a covered coronary stent from Biotronik. It has an ex...
The electronegativity of an atom of an element is a measure of the force with which the atom pulls on the shared electrons in a covalent bond. The index is important to investigate the type of bond that exists between atoms of two elements: For example, ato...