"атомски број" meaning in Serbe

{
  "categories": [
    {
      "kind": "other",
      "name": "Genres manquants en serbe",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en serbe",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Serbe",
      "orig": "serbe",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Serbe",
  "lang_code": "sr",
  "pos": "noun",
  "pos_title": "Nom commun",
  "raw_tags": [
    "genre à préciser : {{m}}, {{f}}, {{mf}}, {{n}} ?"
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en serbe de la chimie",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Lexique en serbe de la physique",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Numéro atomique, nombre atomique, nombre de charge."
      ],
      "id": "fr-атомски_број-sr-noun-Hi55ieB8",
      "tags": [
        "physical"
      ],
      "topics": [
        "chemistry"
      ]
    }
  ],
  "word": "атомски број"
}

{
  "categories": [
    "Genres manquants en serbe",
    "Noms communs en serbe",
    "serbe"
  ],
  "lang": "Serbe",
  "lang_code": "sr",
  "pos": "noun",
  "pos_title": "Nom commun",
  "raw_tags": [
    "genre à préciser : {{m}}, {{f}}, {{mf}}, {{n}} ?"
  ],
  "senses": [
    {
      "categories": [
        "Lexique en serbe de la chimie",
        "Lexique en serbe de la physique"
      ],
      "glosses": [
        "Numéro atomique, nombre atomique, nombre de charge."
      ],
      "tags": [
        "physical"
      ],
      "topics": [
        "chemistry"
      ]
    }
  ],
  "word": "атомски број"
}