grade 7 8 science

Calculate the gram atoms present in 8g of oxyg..

Cl - 17 : 2, 8, 7Valency = 8 - Number of valence electrons= 8 - 7..

During the formation of an ionic bond between the metal sodium and the non-metal chlorine, sodium loses one electron to complete its octet as it has only one electron in its valence shell. It acquires a noble gas configuration of neon (2, 8). While the chlorine atom has seven e..

'. Elements with similar properties recurred at regular intervals and fell in certain groups or families. The elements in each group were similar to each other in many properties. The elements with dissimilar properties from one another were separated. Mendeleev's periodic table contains eight..

The electronic configurations of some of the elements are detailed below. How many valence and core electrons do the following have?(a) Al : 2, 8, 3(b) Mg: 2, 8, 2(c) Cl : 2, 8, 7(d) Ca : 2, 8, 8..

Electron configuration: K L M 2 8 7 Number of valence electrons = 7Valency = 8 - 7 = 1Valence shell ..

Question: The pH of a carbonated drink is ___________. 1. less than 7 2. more than 7 3. equal to 7 4. approximately 7.8 Answer: ..

>The modern periodic table is also known as the long form of the periodic table or the extended form of the periodic table. In this table, the elements are arranged in the order of increasing atomic numbers in such away that elements with similar properties fall in the same vertical column. These v..

Question: An element has an electronic configuration of 2, 8, 7. Its valency is 1. 1 2. 7 3. 17 4. 8 Answer: ..

Question: A certain health conscious person needs to choose between milk of the Surti and the Murrah. Which one should he/she choose? Answer: He/she should opt for the milk from the Murrah as its fat content (<7%) is lesser than that of the Surti (8%-12%)..