Which symbol represents an alkaline earth element ? A. Na B. Mg C. Ne D. Ag

Chemistry

2 answers:

AfilCa [17]3 years ago

8 0

D. hope this helps your question

Blababa [14]3 years ago

5 0

They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). The elements have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure.

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Write the atomic symbol (A ZX) for each of the following isotopes. a. Z $ 8, number of neutrons $ 9 b. the isotope of chlorine i

klemol [59]

Answer:

Explanation:

a) O (oxygen) but there's not enough info to determine the isotope

b) superscript-37 subscript-17 Cl

c) superscript-60 subscript-27 Co

d) superscript-57 subscript-26 Fe

e) don't know what you mean here

f) superscript-7 subscript-3 Li

Edit:

a) superscript-17 subscript-8 O

e) superscript-131 subscript-53 I

5 0

3 years ago

You've just solved a problem and the answer is the mass of an electron, me=9.11×10−31kilograms. How would you enter this number

mihalych1998 [28]

The mass of an electron can be expressed in the box as $\boxed{{m_e} = 9.1 \times {{10}^{ - 31}}{\text{ kg}}}$ .

Further explanation:

Atom is the smallest particle that can be present in any element. It is also known as the building unit of matter. Each atom has a central part that is known as the atomic nucleus. There are three subatomic particles that constitute the atom. These particles are protons, neutrons, and electrons. The atomic nucleus consists of protons and neutrons, both are collectively called nucleons. Electrons revolve around the nucleus of an atom in definite orbits.

Protons are positively charged subatomic particles, electrons are negatively charged and neutrons have no charge. Since electrons carry a unit negative charge, these create an electric field around them. These also participate in nuclear reactions. The mass of an electron $\left( {{m_e}} \right)$ is $9.1 \times {10^{ - 31}}{\text{ kg}}$ , that of protons is $1.6726219 \times {10^{ - 27}}{\text{ kg}}$ and that of neutrons is $1.674927471 \times {10^{ - 27}}{\text{ kg}}$ . The electrons are responsible for chemical properties of elements. The distribution and arrangement of electrons is used to predict whether the element will be inert or reactive.