Magnesium belongs to which representative group? halogens noble gases alkaline earth metals alkali metals

Q: the periodic table, classify these elements as metals, nonmetals, or metalloids. Не Fe K # metal #…

A: Si (Silicon) is metalloid   He (Helium) is non metal

Q: Explain the mechanism of nature on how other elements higher than Iron is being formed.

A:

Q: Which of water, iron, ammonia, chromium, radon, and silicon are chemical compounds as opposed to…

A: We have to write the chemical compounds as opposed to elements

Q: To become a positive ion, does an atom lose or gain an electron?

A: Step 1Atoms consists of neutrons, protons and electrons. Out of these, neutrons are neutral…

Q: Name this compound: Be;N2 triberyllium dinitride triberyllium nitride O beryllium dinitride O…

A:

Q: Element X has 3 isotopes. One of the isotopes has a mass of 59.5 with an abundance of 43.3%. Another…

A: We know that, Average atomic mass of an element is a weighted average of all masses of all isotopes…

Q: Define the composition of an atom along with its electrons, neutrons, and protons.

A: Composition of an atom

Q: What is the atomic number for the element platinum? 78 47 195 56

A: To determine Atomic number of element platinum

Q: The outermost shell is known as.., and electrons that are in orbits farther from nucleus are…

A:

Q: What is the difference between atomic mass and atomic weight? Select one: a. Atomic mass is the…

A: (b) Atomic mass is the mass of an individual atom, whereas atomic weight is the average ( weighted)…

Q: The simplest type of atom to exist is the . atom a. охудen b. hydrogen O C. helium d. boron

A:

Q: True/False and why? A gram of Cesium has more atoms than a gram of Hydrogen.

A: Number of atoms in 1 gram of Cesium is,

Q: The half-life of an element is 20 years. In how many years will there be 12.5% of the initial…

A:

Q: What is the most abundant element in the known universe?

A: There are 114 known elements in the universe.

Q: Which element is a member of the halogen family? A B B I D K

A: In this question we are have to answer which element is a member of the halogen family.

Q: 30 As the atomic number increases across period 3 of the periodic table (A) (B) (C) (D) The…

A: This can be easily be solved by applying the basic concept of periodic table.

Q: hat is the mass of 2.0 mol of H20 gas (water vapour). The atomic ma pxygen is 16.0 g/mol and the…

A: Given: The atomic mass of oxygen is 16g/mol and the atomic mass of hydrogen is 1.00 g/mol. To find:…

Q: Choose the BEST answer to the following. When an element ejects an alpha particle, the atomic number…

A: Generally nuclear decay changes the number of protons in the nucleus of an atom and changes the…

Q: Which of the following is not an element: hydrogen, carbon, oxygen, water?

A: An element is a pure substance which means it consists of only one type of atoms. When the atoms of…

Q: From their location in the Periodic Table, which of the following elements tend to lose 2 electrons…

A: The periodic table elements, tend to lose or gain electrons in order to reach stable configuration…

Q: The atom in its natural state is electrically negative charged. True or false, justify your answer

A: The atom in its natural state is electrically negative charged. False statement. The positive…

Q: Chlorine has 17 electrons. According to the modern atomic theory, how many electrons are found in n…

A: Number of electrons found is n = 2

Q: What determines the identity of the element? Atomic MASS (# of protons and neutrons) Atomic NUMBER…

A: What determines the identity of the element ?

Q: Which element is the primary fuel used to generate electricity using nuclear energy? O coal O…

A: Uranium is the primary fuel which is most widely used to produce nuclear energy.

Q: According to the modern atomic theory, how many electrons are found in n = 2?

A: According to modern atomic theory ,nth shell can have maximum  2(n2) electrons.

Q: 2. Spectrum of the specific wavelengths at which compounds absorb 4. is measured in the…

A: Answer 2 : Absorbtion is maximum at around                      510 nm at which all subjects…

Q: The smallest particle of any chemical element that can exist by itself and yet retain the qualities…

A: We know that, According to Dalton's atomic theory Matter is indivisible But it was wrong Further…

Q: This subatomic particle is what gves the nucleus an overall positive charge. This is the space…

A:

Q: The different colours seen in exploding fireworks are produced using different elements. Element…

A: When a firework is exploded it reacts with oxygen. When it reacts with oxygen the electrons are…

Q: Sketch a model of Carbon-13 with a (-2) charge. - Include the number of protons, neutrons, and…

A: Carbon-13 is an isotope of carbon that contains 6 protons, 7 neutrons and 6 electrons. It has no…

Q: when an atom loses an electron it becomes: A) neutron B) negative ion C) positive ion D) none of the…

A: An atom is electrically neutral that means the number of electrons in the atom is equal to the…

Q: What happens to the properties of elements across any period of the periodic table?   Question 3…

A: The properties of the elements gradually change across any period of the periodic table…

Q: The atomic masses of four element samples are shown in the table below. What would be the most…

A:

Q: In the periodic table, elements are classified as ____________ according to their properties and…

A: Periodic table contains all the known elements in a well arranged manner according to their physical…

Q: The molar mass M of a chemical element is its atomic mass expressed in g/molor equivalently in…

A:

Q: Four marbles are made of different metals. Each marble has the same mass, but a different volume.…

A: Scenario - Four metals have same masses but different densities, hence has different volumes. Given…

Q: Which element rarely reacts because it has 8 electrons in its outer shell? O A. Krypton O B.…

A: Since Krypton is a noble element which rarely reacts and all noble element has 8 electrons in its…

Q: Using the periodic table, Terry draws a model of a helium atom and a hydrogen atom. Match the number…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: The value of ( xk). (kxi) is: O √3 O-1 00 O 3 O +1

A:

Q: Describe the basic structure of the atom, the substructure of all matter.

A: Structure of an atom. The atom is comprised of electron, proton and neutron. They are the subparts…

Q: Elements chemically combine to form 1. atoms. O 2. other elements. 3. isotopes. 4. mixtures. 5.…

A: Elements chemically combine to form compounds.

The Bohr model

Students often get confused between Rutherford’s model and Bohr model of an atom. They interpret the postulates of both these models to be the same, which is incorrect. Rutherford’s model differs from Bohr’s model in the following ways: