Atoms, Ions & Chemical Species...

Negative ions form when atoms _________ valence electrons.

• lose
• gain
• share

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Cations are

• positive
• negative
• on the right side of the periodic table.
• nonmetals

Tags

NGSS.HS-PS1-1

If X is the symbol for an element, which of the following two symbols represent    isotopes of the same element?     I. ⁷⁷₃₅X  II. ⁷⁷₃₃X  III. ⁸¹₃₇X  IV. ⁸¹₃₅ X

• I and II
• III and IV
• I and IV
• I and III

Tags

NGSS.HS-PS1-8

How many total electrons does Mg⁺² (a magnesium ion) have?

• 10
• 12
• 14
• 22

Tags

NGSS.HS-PS1-1

what are isobars

• protons

• atoms that vary in mass

• atoms with same atomic number

• atoms that have the same mass

How many protons does this isotope of titanium have?

• 22

• 26

• 48

• 70

Tags

NGSS.MS-PS1-1

A divalent cation is isobar with the bromine: ⁸⁰₃₅Br and is isotone with Galium ⁶⁷₃₁Ga. Find the number of electrons of the ion.

(Write only the number)

An element has two isotopes with a neutron number of 38 and 40. If the sum of its mass numbers is 104. Find the atomic number. (Write only the number)

A tetravalent anion have 48 electrons y 24 neutrons. Find the mass number. (Only write the number)

A trivalent cation have the same number of electrons of ¹²⁷₅₃I^1- and is isobar with the ¹²²₅₁Sb. Find the number of neutrons. (Write only the number)