Chemistry, 02.08.2019 07:20 Deuce9024

An element “x” has mass number 35 and the number of neutrons is 18. identify the group number and period of “x”.

Answers: 2

Show answers

Answers

~Hello There!~

35 - 18 = 17
17 electrons means 7 outer shell electrons
Group number 7 - The Halogens
Electron configuration is 2. 8. 7
3 shells therefore in period 3

Hope This Helps You!
Good Luck :)
Have A Great Day ^_^

- Hannah ❤

Answer from: k3rbycalilung

The mass number is the sum of the number of protons and neutrons of an element. So, to determine the element "X", we have to subtract 18 from 35, which makes it 17.

From the periodic table, the element with 17 protons is chlorine. Chlorine is in the Group VII, as known as halogens. It is the 3rd period in the periodic table.

Halogens very reactive. One thing they have in common is that they have 7 outmost shell electrons. Chlorine is the second in that group.

Period 3 means that it has 3 occupied shells. The arrangements of the electron shells of chlorine should be 2,8,7

Answer from: Quest

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

Answer from: Quest

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

Another question on Chemistry

Chemistry, 21.06.2019 23:00

At room temperature what happens to the average kinetic energy of the molecules of a solid, liquid, and a gas

Answers: 2

Answer

Chemistry, 23.06.2019 00:00

How many grams are in 68.2 molecules of br2?

Answers: 3

Answer

Chemistry, 23.06.2019 02:00

Scientists are often interested in knowing the molar heat of combustion – the heat released during the combustion of one mole of a substance. use the periodic table to find molar masses. how many moles of ethanol are present in the sample?

Answers: 2

Answer

Chemistry, 23.06.2019 02:00

Pinene is an unsaturated hydrocarbon found in pine resin. if pinene has m+ = 136 and contains 1 double bond(s) and 2 ring(s); what is its molecular formula? enter the formula in the form ch first, then all other atoms in alphabetical order; do not use subscripts. the formula is case-sensitive

Answers: 3

Answer

You know the right answer?

An element “x” has mass number 35 and the number of neutrons is 18. identify the group number and pe...

Questions